Wendy's-Inspired Keto Chocolate Frosty Recipe

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Introduction

Few things beat a cool, chocolatey Frosty on a warm afternoon. Wendy’s has been serving its Chocolate Frosty since 1969, and it’s stayed a favorite for good reason: it’s not quite ice cream, and it’s not quite a shake — it’s a Frosty, thick and cold and spoonable all its own.

The catch with the original is the sugar: a large Frosty carries far more than a keto day has room for. So we set out to make a version we could enjoy on a low-carb diet, using just four ingredients you probably already have — heavy whipping cream, unsweetened cocoa powder, Lakanto powdered sweetener, and a splash of vanilla. It comes out thick, cold, and chocolatey like the drive-thru classic, with much less sugar and far fewer carbs than a traditional Frosty (the per-serving Nutrition Facts are below).

Wendy’s Chocolate Frosty, but keto. Grab a blender and let’s take on a classic together.

Key Ingredients and Tools

This easy-to-make keto chocolate frosty only uses four ingredients:

Lakanto Powdered Monk Fruit Sweetener

Powdered is the form this recipe is written for. Lakanto Powdered Monk Fruit Sweetener is a blend of monk fruit and erythritol sold as a 1:1 replacement for powdered sugar, so the two tablespoons in the recipe are easy to measure. Personally, we don’t notice an aftertaste with it, which is one reason we reach for it in desserts like this. If you have a different monk fruit product and are not sure whether its form will behave the same way, our monk fruit sweetener guide explains the difference between powdered, granulated, golden, and liquid products.

Unsweetened Cocoa Powder

Two tablespoons of unsweetened cocoa powder is where the chocolate comes from, and unsweetened is the point — a sweetened cocoa mix brings its own sugar into a recipe that is sweetened separately, and you lose control of how sweet the thing ends up. Cacao powder is the other unsweetened option if that is what is in the cupboard; no adjusted amount for it is given here.

Vanilla Extract

Half a teaspoon, and it is doing one specific job: taking the hard edge off unsweetened cocoa. You should not be able to pick the vanilla out of the finished frosty — if you can, there is too much in.

Heavy Cream

The cream is most of the recipe. A cup of it whipped to stiff peaks is what gives the frosty its structure before it goes anywhere near the freezer, and that trapped air is the difference between something you spoon and a solid block of ice. Almond milk will not whip and will not hold air, so it is not a substitute here.

Tools

  • A bowl with room to whip in, and a whisk, hand mixer or stand mixer. A whisk gets there; the mixer gets there faster.
  • A spoon, or a blender. Half an hour in the freezer leaves the mixture stiff, and the stirring or quick blend at that point is what turns it into a Frosty rather than a frozen lump.

Keto Chocolate Frosty

Prep Time
5 minutes
Additional Time
30 minutes
Total Time
35 minutes
Yield
3 servings
Course
Dessert
Cuisine
American
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Ingredients

All Ingredients

Nutrition Facts

3 servings per recipe
Trans Fat 0g 0% 0g 0%
Total Sugars — —
Allulose 0g 0% 0g 0%

Where you see an em dash: one of the ingredients in this recipe does not publish a figure for that row, so we cannot add one up honestly. We would rather show you nothing there than a zero we cannot stand behind.

About these numbers: We are home cooks, not certified nutritionists. Nutrition is shared as a courtesy. We pick a representative product for each ingredient, and our recipe system works out the totals from the amounts in this recipe, so please treat them as a helpful estimate rather than a guarantee. The brands you buy, any swaps you make, and how generously you portion the recipe will all move these numbers.

Directions

  1. Prepare your four ingredients (Lakanto powdered monk fruit sweetener, unsweetened cocoa powder, vanilla extract, and heavy cream).

    In separate cups or bowls, pour each ingredient in the proper proportion (1 cup heavy cream, 2 tbsp unsweetened cocoa powder, 2 tbsp Lakanto powdered sweetener, and 1/2 tsp vanilla extract).

  2. Pour all ingredients into a mixing bowl.

    Use a bowl large enough to contain all the ingredients so you can mix them comfortably without spilling anything.

  3. Blend the ingredients until stiff peaks form.

    Using a whisk, blend the ingredients until stiff peaks form. You may also use an electric hand mixer or stand mixer to speed up the process. This gives the mixture its whipped-cream structure before freezing.

  5. Freeze the mixture for about 30 minutes, or until barely frozen.

    After freezing, the mixture will become stiff. Spoon-mix it to achieve that coveted Frosty-like consistency (or use a blender) — something close to soft-serve chocolate ice cream.

  6. Serve in a mug, cup, or bowl.

    Grab a spoon or a straw and enjoy your keto chocolate frosty.

Notes

Tips and Tricks

  • Adjust the amount of unsweetened cocoa powder to taste — a little more for a deeper chocolate flavor, a little less for a milder one.

Two starting points rather than second versions of the recipe — no adjusted amounts for either are given here:

  • For a dairy-free frosty, full-fat coconut cream is the usual stand-in for the heavy cream. It whips and freezes differently, so expect a different texture.
  • Another keto-friendly powdered sweetener will sweeten it; they vary in sweetness by volume, so start under the two tablespoons and add to taste.

Frequently Asked Questions

Do I really need to use Lakanto Powdered Monk Fruit Sweetener?

No — you can use another keto-friendly powdered sweetener, such as Swerve. We reach for Lakanto because we personally don’t notice an aftertaste with it, and it’s sold as a 1:1 replacement for powdered sugar, which makes it easy to measure into dessert recipes. Sweeteners vary in sweetness, so if you swap, start with a little less and adjust to taste.

Can I use a sugar-free chocolate bar instead of cocoa powder?

Not as a measured swap — no equivalent amount of bar for the two tablespoons of cocoa powder is given here, and the two are not the same ingredient. Cocoa powder is cocoa solids with most of the fat pressed out; a bar is those solids plus cocoa butter plus whatever sweetens it, so it carries sweetness the recipe adds separately, and you would be guessing at both amounts at once.

It also has to be melted and then cooled before it meets a cup of cream you are about to whip, which is a step and a risk the powder does not have.

If you want to compare them on carbs, read the two labels at the amount you would actually use rather than per 100 g — sugar-free bars differ widely from each other, and the sweetener in them is most of the difference.

Is it okay to prepare this keto frosty beforehand?

Absolutely! You can make it ahead and keep it in the freezer rather than serving it right away. Since this frosty is set by freezing, the longer it stays in the freezer the firmer it gets — if it freezes solid, let it sit at room temperature for a few minutes, then give it a stir or a quick blend to bring back the soft, spoonable Frosty consistency before serving.

For that classic soft-serve texture, it’s best enjoyed soon after the initial 30-minute freeze. Chilling it in the refrigerator instead won’t set it — it needs the freezer to reach a Frosty consistency.

Can I make it vegan-friendly?

The only non-vegan ingredient here is the heavy cream. Full-fat coconut cream is the usual dairy-free stand-in for whipping, and the chilled solid part of the can is the part that whips — the water at the bottom will not. It freezes harder than dairy cream does, so expect a firmer frosty and a longer stir to loosen it. No adjusted amount or freezing time for it is given here. If you give it a try, let us know how it goes in the comments.

Conclusion

Half a century on, the Chocolate Frosty is still a classic — and now you’ve got a low-carb version you can make at home whenever the craving hits. Have another cup… or mug… or bowl.

Updated — August 6, 2026: We rewrote this recipe with clearer ingredient guidance, expanded step-by-step instructions, new process photos, and answers to common questions.

Correction — August 6, 2026: Removed an unsupported zero-glycemic claim about the monk fruit sweetener and now describe it in plainer, non-absolute terms.