Keto Frappuccino
Published June 5, 2021 • Updated July 20, 2026
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I make this keto frappuccino all summer long instead of spending $6 at Starbucks. Coffee ice cubes keep it thick, and the whole thing comes together in five minutes.
The day I looked up how much sugar is in a Starbucks mocha frappuccino, I stopped ordering them. I started making my own keto mocha frappuccino at home, and at 0.6 grams of net carbs per serving, it wasn’t even close. The taste is just as good (I’d argue better, but I’m biased).
The thing that makes this recipe work is the coffee ice cubes. Regular ice melts and waters everything down within minutes. Coffee ice cubes keep every sip as strong as the first. I brew a full pot, pour half into ice cube trays, and refrigerate the rest. By the time the cubes are frozen, the coffee is cold and ready to blend.
The base is simple: brewed coffee, coconut milk (or any unsweetened nut milk), heavy cream, monk fruit sweetener, and cocoa powder. I use unsweetened cocoa powder for that deep mocha flavor without adding carbs. Everything goes into a blender for about 30 seconds. If you like your drinks thicker, toss in a few extra coffee ice cubes.
If you’re into keto coffee drinks, I have a whole collection. My keto cold brew coffee is what I reach for on mornings when I want something no-fuss. The keto caramel macchiato scratches a different itch (more dessert-y), and my keto dalgona coffee is the one that always gets comments on Instagram.
For a non-coffee frozen treat, my sugar free frozen hot chocolate uses the same blending technique and hits that same thick, frosty texture. I make both on rotation all summer.
One thing I noticed after making this dozens of times: the sweetener matters more than you’d think in a frozen drink. Granular sweeteners like straight erythritol can turn gritty once they hit the ice. I switched to a powdered monk fruit blend and the texture difference was immediate. Smooth, no graininess, just clean sweetness.
Reader Cynthia adds protein powder to hers (chocolate for her husband, vanilla for herself) and says it holds up great. I’ve tried it with collagen peptides too, and they dissolve completely without changing the flavor. If you want extra protein, that’s a solid add.
I top mine with a generous pile of whipped cream. Coconut whipped cream works if you’re keeping it dairy-free. Either way, drink it before the whipped cream melts into the coffee, which honestly is its own kind of good.
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Ingredients
3 cups brewed coffee, divided -
1/2 cup coconut milk or other nut milk
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1/4 cup heavy whipping cream or coconut cream
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2 tablespoons monkfruit blend sweetener
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2 tablespoons 100% unsweetened cocoa powder
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whipped cream or coconut whipped cream, optional
Step by Step Instructions
Step by Step Instructions
Make coffee ice
Pour 1 cup coffee into an ice cube mold and freeze to make coffee ice. Place remaining coffee in the fridge to cool.
Blend
Add cold coffee, coffee ice cubes, ½ cup ice, nut milk, heavy cream, sweetener, and cocoa powder to a blender. Blend 30 seconds or until smooth.
Do you want whip with that
Pour into your glass and top with whipped cream.
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 do I order a keto version at Starbucks?
I've done this a few times when I'm traveling and can't make my own. I ask for an unsweetened iced coffee with extra ice, a sugar-free vanilla syrup, and a splash of heavy cream, then ask them to blend it. Skip the frappuccino base (that's where all the sugar lives). It's not on the menu, but I've never had a barista refuse.
What sweetener works best in a frozen drink?
I've tested a few, and powdered or liquid sweeteners work best. Granular erythritol turns gritty when it hits the ice. I use a powdered monk fruit blend and the texture stays completely smooth. Allulose is another one I've had good luck with because it dissolves cleanly even at cold temperatures.
Can I add protein powder or collagen?
My reader Cynthia does this regularly. She uses chocolate protein powder for her husband and vanilla for herself. I've tried collagen peptides and they dissolve completely without changing the flavor or texture. If you go with a flavored protein powder, I'd cut back on the cocoa powder a bit so it doesn't get too intense.
What blender do you recommend?
I use a Ninja and it handles this perfectly. A Vitamix or BlendTec will give you an even smoother result, but my Ninja gets the job done in 30 seconds. The key is having enough liquid so everything moves freely. If it stalls, I add a splash more coconut milk rather than pushing it.
Can I freeze leftovers instead of refrigerating?
I've frozen it for up to a month and re-blended before serving. It holds up well. I just pour leftovers into a freezer-safe container, and when I'm ready, I pop the frozen block into the blender with a splash of coffee or milk. It comes out just as thick as a fresh batch.
Does xanthan gum help keep it from separating?
My reader Maria suggested adding 1/8 teaspoon of xanthan gum, and she was right. It keeps the drink from separating once it sits for a few minutes. I don't always add it (I usually drink mine fast enough), but if you're making a batch for the family or want it to hold while you finish something, it makes a real difference.
Can I use instant coffee instead of brewed?
I've tried it and it works fine. I mix 2-3 tablespoons of instant coffee with a cup of hot water, let it cool, then follow the recipe from there. You can freeze the instant coffee mixture into ice cubes the same way. The flavor is a little different from brewed, but it still makes a good drink.
Made it this morning. Came out perfect.
Four servings technically, two and a half in practice because my husband decided he's quality control now. He's convinced it needs more cocoa and less sweetener, so at this point I'm just making him a separate blend. A lot of fuss for something that takes five minutes, but that's what you get for letting someone try it once.
Valerie, the 'quality control' husband is a situation I know well. I've tested the higher cocoa version (3 tablespoons instead of 2) and it does go more mocha, richer. He's not wrong. The catch is the sweetener balance shifts when you push the cocoa up, so I'd go to 1.5 tablespoons on the monkfruit and taste from there. Two separate blends at five minutes each is still ten minutes, which beats the $12 Starbucks run for two.
I was sure the heavy cream would make this too thick to blend properly, the kind of ratio that clumps around the blades. It doesn't. The coffee ice does most of the texture work and everything comes together in under a minute. Four stars because the cocoa is a little quiet by the bottom of the glass, one more tablespoon gets you closer to actual mocha territory.
That gritty finish at the bottom of the glass drove me crazy. Granular sweetener just doesn't dissolve in cold liquid, so I started whisking the monkfruit into the hot coffee before pouring it into the molds. Blends in completely, stays smooth. Still dialing in my cocoa ratio, but that one fix made all the difference.
Used my weekly Starbucks as a keto exception for almost a year. This cut that out. Gets me 90% there, and the coffee ice, didn't think that part would actually work.
The coffee ice was the part I was least sure about. Water ice just wrecks the flavor once it melts, either that part works or you're still driving to Starbucks.
Pouring this into my glass on a Saturday morning and the cold cocoa smell sent me right back to college summers, specifically a closing shift at a coffee shop where the free-drink perk was the only reason I stayed past midnight. Always a mocha frappuccino, always felt fancy in a way nothing else did. Fifteen years and I'd stopped looking for anything close. The coconut milk is what does it, that little tropical softness against the bitter cocoa. It just works. Used Kerrygold heavy cream and double-strength brew for the cubes, monkfruit sweetener dissolved completely, no aftertaste. Grateful this exists.
Double-strength cubes is something I keep forgetting to put in the recipe notes, holds the coffee flavor when they melt. And closing shift mocha? College you had taste.
0.6 net carbs, and two people at a potluck last weekend pulled out their phones to verify that number. I brought a pitcher instead of buying drinks and it read as a coffee shop order until I mentioned I'd made it. The coffee ice cubes are what make it work for a crowd (they melt into coffee, not plain water, so the last pour tastes the same as the first). Probably doubling the batch next time.
The pitcher move for a crowd is smart. Double it no problem, I'd just freeze the coffee ice cubes the night before so you're not scrambling day-of.
Added a tablespoon of almond butter when I ran short on heavy cream and it came out creamier than expected. The cocoa picks up this mocha-nut edge when you do it that way, which I wasn't aiming for at all. Going to try it deliberately next time and see if it holds up.
That mocha-nut thing makes sense once you think about it, cocoa and almond butter basically pull toward each other. Keep the full tablespoon when you go deliberate, probably won't get the same creaminess with less.
Swapped the coconut milk for unsweetened almond milk and added a splash of vanilla extract, and it came out tasting more like the Starbucks vanilla version I used to get. The coffee ice cube trick is what finally stopped it from going watery on me, which was my whole issue with blended coffee recipes before this one.
Almond milk with vanilla gets you closer to that lighter Starbucks flavor. Coconut pulls it tropical, which I like, but it's a different drink. And yeah, skip the coffee ice cubes once and it's immediately obvious why they matter.
Thought the coffee ice cubes were extra hassle until I skipped them once and got brown watery milk. Turns out this beats my usual Starbucks order, which I wasn't expecting to admit.
Yeah, the coffee ice cubes ARE the texture. Regular ice just waters it down as it melts. The Starbucks thing catches people off guard every time.
Been making this pretty much every week since March. Started with oat milk but switched to coconut milk after the second batch (oat milk made it too sweet, threw off the bitterness balance). The coffee ice cubes are the thing everyone should know going in, regular ice just dilutes it. I add an extra tablespoon of cocoa powder and it comes out closer to a mocha, which is where I wanted it.
Oat milk runs sweeter than you'd think, so the switch makes sense. Extra cocoa for mocha, I haven't tried but I'm going to.
My daughter watched me blend this and asked if I ordered delivery from Starbucks (she's 9 and very suspicious of anything homemade that looks that good). The coffee ice cube trick for keeping it thick without getting watery kind of blew my mind a little.
Nine-year-old Starbucks radar is ruthless.
I've made this probably a dozen times since last summer and finally dialed in the coffee ice cube ratio that works for me. Strong brew, freeze it overnight. Never waters down. Already made my first batch of the season this week.
Strong brew makes such a difference for the cubes. Mine's almost espresso-strength. This is basically my May through September drink.
Tried four other keto frapp recipes and every single one goes watery halfway through. The coffee ice cubes here actually fix it. Nothing waters down when it melts.
Four recipes is a lot of watery frapps. The cubes were the only fix I found.
My 12-year-old has been demanding Starbucks every weekend all spring, so I made her try this instead. She took one sip and immediately asked for another. The coffee ice cube trick is freaking genius and now she thinks I figured out some secret.
Ha, don't tell her it's just frozen coffee. My kids have been 'impressed' by this for three summers now.