Thick, chewy keto cookie bars straight from the oven, topped with vanilla ice cream and a sugar-free chocolate magic shell that cracks when you dig in — just 2g net carbs.
I started making these because I wanted a dessert that felt special but only took 30 minutes start to finish. What I ended up with is a thick, gooey chocolate chip bar that comes together in one bowl and bakes in about 25 minutes. Soft in the center, slightly crispy at the edges. The kind of thing you pull out of the oven and immediately want to eat half the pan. The a la mode part (ice cream and homemade magic shell on top) turns it into something you would actually serve to company.
The base uses a keto cake mix (I use Duncan Hines), plus melted butter, nut milk, eggs, and sugar-free chocolate chips. Four extra ingredients and you have cookie bars ready for the oven. I have made these dozens of times now and the texture is consistent every batch. The center stays soft and chewy while the edges get a little golden and firm. If you have ever had a cookie at a bakery where the edges have that slight crunch, that is what you are getting here. I spread the dough about 3/4 inch thick in the pan, which is the sweet spot I have found. Any thinner and you get flat, crispy bars. Any thicker and the center stays underdone even at 27 minutes.
What sets this apart is the a la mode build. You slice the bars while they are still warm, add a scoop of vanilla ice cream, and drizzle homemade chocolate magic shell on top. The chocolate hardens into a crackling shell the second it hits the cold ice cream. Warm bar, cold ice cream, crunchy chocolate. That combination of temperatures and textures is honestly why I keep making this instead of just regular cookies.
The whole recipe is also gluten free since the cake mix uses almond flour instead of wheat. I never used to think about mentioning that, but a few readers asked and it matters if you are baking for someone with a sensitivity. I have served these at dinner parties where half the table was not keto and nobody could tell the difference. That is always my test for whether a recipe is worth keeping.
My family has started calling Friday nights "cookie bar night" which I did not plan but also have not corrected. I slice the bars, set out ice cream and a bowl of magic shell, and let everyone build their own plate. The whole thing takes maybe 35 minutes from mixing to eating.
If you love this style of dessert, I also have keto chocolate chip cookies made from scratch with almond flour for when you want the classic. My keto ice cream sandwiches are another good ice cream pairing. And for a different warm bar, my keto s'mores hit that same indulgent spot.
Why I use a cake mix for these bars
When I don’t feel like pulling out a dozen ingredients and measuring cups to make cookies from scratch, a boxed cake mix handles it. I have tested a few low carb options and these are the two I keep going back to:
Both give you a soft, chewy bar with real cookie flavor. The Duncan Hines keto mix is what I used in this recipe, but Scotty’s works well too. If you want something closer to a brownie, my low calorie brownies are a good alternative.
How to make keto magic shell
Magic shell is a liquid chocolate topping that instantly hardens when poured over cold ice cream. I make my own sugar-free version by melting chocolate chips with coconut oil. The ratio I have landed on is 1/4 cup chips to 2 teaspoons coconut oil. That proportion gives you a shell that cracks cleanly without being too thick.
For extra depth, I stir in a 1/2 scoop of Cacao Bliss by Earth Echo (my partner for this recipe). It’s a raw cacao powder blend with superfoods that each add something specific:
Cinnamon (for sugar regulation and gut support)
Turmeric (for inflammation)
Black pepper (increases turmeric bioavailability)
Himalayan salt (for pH balance)
Lucuma (supports the body’s repair mechanisms)
Coconut nectar (a prebiotic for gut health)
I like what it does to the flavor. If you are into rich chocolate desserts, my keto fudge and keto chocolate trifle use a similar chocolate-forward approach.
Use my code KETOFOCUS to save 15% off your Cacao Bliss order.
Storage and freezing
I store leftover bars in an airtight container at room temperature for 3-4 days. They are best served warm, so I reheat them in the oven (350 degrees for 5-6 minutes), the air fryer (3 minutes at 300), or the microwave (15-20 seconds). I have tested all three and the oven gives the best texture with crispy edges, but the microwave works in a pinch.
You can also freeze these for up to 2 months. I wrap each bar individually in plastic wrap, then store them in a freezer bag. To serve, thaw at room temperature for about 20 minutes or reheat straight from frozen in the oven at 350 for 8-10 minutes.
The magic shell chocolate sauce should be made fresh each time. It only takes a minute in the microwave.
How to make cookie bars a la mode
Make the bar base by combining a boxed cake mix with melted butter, nut milk, eggs, and chocolate chips. I spread it into a parchment-lined 8x8 dish and bake at 350 degrees for 25-27 minutes. You want a clean knife when you test the center.
Slice while still warm. I give them about 3-5 minutes to set, then cut into squares. They hold together better slightly warm than straight out of the oven.
Build the a la mode. Top each square with a scoop of vanilla ice cream and drizzle the homemade magic shell over the top. It hardens on contact.
Preheat oven to 350 degrees Fahrenheit. Coat a square 8×8 baking dish with cooking spray and line with parchment paper. Set aside.
2
Make cookie dough
In a large bowl, add cake mix, melted butter, nut milk, eggs and chocolate chips. Stir to combine.
For this step
10.6 oz box keto cake mix
1/2 cup unsalted butter, melted
1/3 cup nut milk
2 eggs
1/2 cup sugar-free chocolate chips
3
Bake
Scoop cookie dough into prepared baking dish. Spread evenly. Bake at 350 degrees for 25-27 minutes or until a knife inserted in the center comes out clean. Let cool for 3-5 minutes before slicing into squares.
4
Make chocolate magic shell
In a small bowl, add chocolate chips and coconut oil. Microwave at 30 second intervals, stirring in between, until melted.
For this step
1/4 cup sugar-free chocolate chips
2 teaspoons coconut oil
5
A la mode it
To assemble, place a cookie bar square on a plate. Top with a scoop of vanilla ice cream. Drizzle melted chocolate sauce on top.
Nutrition
Per serving: 1 square
Calories
241
Fat
23.6g
Protein
2.4g
Total carbs
11.9g
Net carbs
2g
Nutrition is an estimate calculated from the ingredients listed. Brands vary, so check labels if you track closely.
Frequently Asked Questions
How many net carbs are in these bars?
Each bar (without ice cream and magic shell) comes out to about 3-4g net carbs depending on which cake mix you use. I use Duncan Hines Keto Cake Mix for this recipe. With a scoop of ice cream and the magic shell, I'm usually around 6-8g net carbs total per serving.
Can I freeze these bars?
I freeze these all the time. I wrap each bar individually in plastic wrap, drop them in a freezer bag, and they keep for up to 2 months. When I want one, I either thaw it on the counter for about 20 minutes or put it straight in the oven at 350 for 8-10 minutes from frozen. The texture holds up well after thawing.
Can I make double chocolate bars?
I have done this and it works great. Just use a chocolate cake mix instead of the yellow variety and keep the chocolate chips in there too. It comes out more like a keto double chocolate chip cookie in bar form. Rich, fudgy, and very satisfying.
How can I make this recipe dairy-free?
I swap the melted butter for melted coconut oil (same amount) and use dairy-free ice cream on top. The bars taste just as good with coconut oil. I actually prefer the slight coconut undertone it gives the base.
What keto cake mix brands work best?
I have tested Duncan Hines, Scotty's Everyday, and Sweet Logic. All three work. Duncan Hines gives me the chewiest result, which is what I want in a bar like this. I haven't tested every brand out there, so if you try a different one, the results might vary.
Are these bars gluten free?
Yes. The keto cake mixes I use are almond flour based, so there is no wheat in these. I have served them to friends with gluten sensitivities and had no issues. Just double check your specific cake mix label to be sure.
Can I make these without a boxed cake mix?
You can, but it becomes a different recipe at that point. My keto almond flour chocolate chip cookies are made from scratch if that is what you are after. The whole point of this recipe is the shortcut. I reach for it when I want dessert in 30 minutes, not an hour.
How do I reheat leftover bars?
I have tested the oven, air fryer, and microwave. The oven (350 degrees, 5-6 minutes) gives the best texture with crispy edges. The air fryer at 300 for 3 minutes is a close second. The microwave works if you are in a hurry (15-20 seconds), but the edges won't crisp back up. I always reheat before adding ice cream.
Mine clicked at batch three, Camila. Two tablespoons of coconut oil per cup of chips, and pour it on while the bars are still a little warm. Cold chocolate on a cold bar never sets right.
I’m pretty deep into year two of keto and I’d mentally crossed dessert a la mode off the list entirely. Not cookie bars specifically, just the whole warm-thing-plus-ice-cream category felt impossible to replicate. Made these last Friday and when the magic shell cracked under my spoon I laughed at myself for writing it off. The Duncan Hines mix bakes up way more like a real cookie bar than I was bracing for. Would’ve given this five stars but I pulled mine out about two minutes late, so four for now.
Closest I’ve gotten to a restaurant pizookie at home. The coconut oil in the magic shell is what does it. Same resistance, same crack. Then the bar gives all at once.
The coconut oil thing is real, Jason. I’ve tried vegetable oil and the snap comes out softer, less dramatic. Coconut oil solidifies, so you actually get that resistance before the crack.
9 servings from one 8×8 assumes you have discipline I don’t. I double batch and cut all 18 before the week starts, individually wrapped. Holds shape better. Reheat 30-40 seconds in the microwave, not the oven, and the center softens back up fast. What the recipe skips: the bar needs to be warm when you assemble. Cold bar against cold ice cream isn’t the point. I keep the magic shell ingredients separate and make it fresh each time. Two minutes, barely worth storing the leftover. Protein is 2.4g per square so practically I count on eating two, factor that in when you’re portioning.
The warm bar thing is real, Ryan. I’ve served these cold and it’s just two cold things sitting on a plate. Microwave makes more sense here anyway, you want the center soft, not the edges re-crisped by the oven.
Stick with the cake mix even if your gut says scratch. I tried almond flour first and it turned to mush under the ice cream in about two minutes. Duncan Hines just doesn’t do that. Kind of the whole point when you’re serving it a la mode.
Two minutes is generous. I tested almond flour too and mine went soggy before I even got the scoop of ice cream on there. The boxed mix holds up in a way scratch just can’t match.
Somewhere around the fourth batch I started pulling these a few minutes early, and the centers stayed fudgy instead of setting all the way through. The magic shell still cracks the same when you dig in (that part never gets old), but it feels totally different against the ice cream when the bar has some give to it. Warm and a little gooey is the move. Pretty sure I’ll never go back to full bake time.
Heavy cream does that. More fat than nut milk so the crumb tightens up and you lose that cakey lift. Dense and chewy is actually my preference for bars so I might do this on purpose next time.
My daughter has been suspicious of every keto dessert I’ve made, so when I set these out with the ice cream and magic shell she gave me the look. First bite and she went quiet. Then I watched her spend two minutes just slowly cracking the chocolate shell with her spoon, completely ignoring the rest of dinner. She has never once done that with anything I’ve made.
I almost didn’t try this (never made anything keto from scratch before), but the magic shell sold me. Melted the chocolate chips with coconut oil and just watched it harden over the ice cream in real time. Wild. Two grams of net carbs and it tasted like actual dessert. Do the bars hold up if you make them the day before and reheat, or does it have to be fresh out of the oven?
They hold up great the next day. I reheat in the oven at 350 for 5-6 minutes and the edges come back crispy. Air fryer at 300 for 3 minutes is a close second if you want faster.
Pressed flaky sea salt into the top right before it went in the oven and now the way it plays against the magic shell cracking over ice cream is kind of unreal, I’m fully obsessed.
If you’re new to this: let the bars sit for at least 10 minutes before cutting them. I didn’t the first time and they came apart in chunks. Let them rest and they slice clean, and the magic shell actually cracks the way it should when you pour it over warm. Didn’t realize the coconut oil was what made that happen until I looked it up. Obvious in hindsight but worth knowing.
Coconut oil goes solid at room temp, which is why it snaps instead of just hardens. And 10 minutes is the real number. I’ve cut at 5 and the bars split right where the chocolate hits.
Magic shell nailed it. The bars came out crumbly at the edges though, hard to plate cleanly. Making it again, pressing the dough harder into the corners.
Browned the butter before mixing it in instead of just melting it, and the base has this almost toffee-y depth I wasn’t expecting from a cake mix bar. Three batches in and that’s the one step I won’t skip. The sugar-free magic shell over a still-warm bar is doing something I can’t stop thinking about, that crack is real and it’s absurd. One note: the Duncan Hines mix bakes up better at 22-23 minutes in my oven. The 20-minute mark left the center slightly underdone the first time. Four stars, but the browned butter version is closer to five.
Give the bars about 3 minutes to cool before you top them, and the magic shell actually cracks the way it should instead of just softening into the ice cream.
Tried probably five different keto blondie recipes this winter and none of them had the chew like this one. The Duncan Hines mix does something the almond flour-from-scratch versions just don’t.
