Keto Cookie Bars a la Mode
Published January 26, 2023 • Updated March 1, 2026
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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.
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.
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 8×8 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.
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Keto Cookie Bars Ingredients
1 (10.6oz) package Duncan Hines Keto Cake Mix -
1/2 cup unsalted butter, melted
-
1/3 cup nut milk
-
2 eggs
-
1/2 cup sugar free chocolate chips
Keto Magic Shell Ingredients
-
1 pint keto vanilla ice cream
-
1/4 cup sugar free chocolate chips
-
2 teaspoon coconut oil
Step by Step Instructions
Step by Step Instructions
Preheat oven & prepare baking dish
Preheat oven to 350 degrees Fahrenheit. Coat a square 8×8 baking dish with cooking spray and line with parchment paper. Set aside.
Make cookie dough
In a large bowl, add cake mix, melted butter, nut milk, eggs and chocolate chips. Stir to combine.
- 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
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.
Make chocolate magic shell
In a small bowl, add chocolate chips and coconut oil. Microwave at 30 second intervals, stirring in between, until melted.
- 1/4 cup sugar-free chocolate chips
- 2 teaspoons coconut oil
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 disclaimer
The nutrition information provided is an estimate and is for informational purposes only. I am a Doctor of Pharmacy (Pharm.D.); however, this content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician or other qualified health provider before making any lifestyle changes or beginning a new nutrition program.
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Get My Macros + Recipes →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.
I've made at least a dozen keto bar recipes in the past year, and most of them either nail the texture or the flavor, not both. This one actually does both. The Duncan Hines cake mix base gives the dough a real cookie consistency, chewy without being dense, something I have not been able to get from any from-scratch attempt. The chocolate magic shell cracking over the cold ice cream is hard to explain until you try it. I'm giving it four stars because I was working with a keto ice cream brand I won't buy again, and I want to redo this properly before I commit to five. Already planning to make it next weekend with the right ingredients.
Some keto ice creams are too icy and it kills the contrast with the warm bar. What did you use? I'm curious if it's the same one I've had issues with.
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.
Two minutes just working on the chocolate shell, rest of dinner ignored. She made the right call.
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.
Pressed salt bakes into the crust instead of just sitting on top. The contrast with the magic shell snap is real. Stealing this.
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.
Pressing harder is right. I also run a knife along the edges right out of the oven before they set. Cleaner cuts.
Used heavy cream instead of nut milk because that's what I had, and the bars came out noticeably fudgier in the center. Still set up fine, just denser and richer. The magic shell cracking open over the ice cream is almost theatrical at this point. I keep a batch in the freezer just to have an excuse to assemble this.
Yeah, heavy cream pulls the center fudgier. I've done that swap on purpose when I want more of a brownie thing going on.
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.
Browned butter in a cake mix bar, I hadn't thought of that. Trying it this week. And yeah, my oven lands at 22 too.
Made these Sunday and my daughter was fully convinced I'd bought them from somewhere because of how the chocolate shell set up. She kept picking at the hardened edges trying to figure out if it was store-bought or homemade. When I told her it was just chocolate chips and coconut oil she genuinely didn't believe me. Making these again this weekend.
Ha, the store-bought question. Two ingredients and it passes every time.
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.
Yes, and the colder the bars the louder the crack. Two to three minutes is my sweet spot too.
First time making anything keto and the magic shell actually cracked like it should. Does the ice cream brand matter, or do they all work the same?
Most work fine. I use Rebel or Enlightened because they scoop clean and don't get watery before the magic shell sets.
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.
Scotty's and Sweet Logic both work. Duncan Hines is the only one that gets the chew right.