Sugar Free Copycat Frosty Recipe

This Sugar Free Copycat Frosty is creamy, chocolaty, and comes together in under five minutes — no drive-thru required. It lands somewhere between a milkshake and soft-serve, and honestly, it hits the spot every single time.

Why You’ll Love It

No added sugar — made with a granulated sugar alternative and sugar free ice cream, so it fits your diet without the guilt
Ready in under 5 minutes — blend, pulse, done
Perfect frosty texture — thick enough for a spoon, smooth enough for a straw
Only 4 ingredients — nothing complicated, nothing you have to hunt down
Easy to customize — thinner, thicker, flavored with extract — it’s all up to you

A Note About the Ingredients

The sugar alternative here is Splenda, because that’s what I keep on hand. I’ve tried a few others over the years and they work fine — I think most granulated alternatives behave about the same in a cold application like this. Just avoid the liquid drops unless you know your measurements; they can sneak up on you.
The cocoa is just unsweetened cocoa powder. Nothing fancy. I buy the big can from whatever’s on sale, and it lives on the second shelf next to the baking soda. I’ve had the same brand for probably two years and it’s fine.
The sugar free vanilla ice cream is the main thing to shop around for. Some brands are better than others — I’ve had a couple that had a weird aftertaste I couldn’t get past. Read labels, taste test, figure out what you like. That part’s on you.
Milk is just milk. I use 2%, sometimes whole. I don’t think it matters that much.

Ingredients

3 teaspoons Splenda (or your preferred granulated sugar substitute)
1 teaspoon unsweetened cocoa powder
2 cups sugar free vanilla ice cream — maybe a touch less if it’s very hard and you want a thinner result
½ cup milk

How to Make It

Start by mixing the Splenda and the cocoa together in a small bowl. I do this with a fork. The reason you do it this way — and I learned this the hard way the first time, with a weird brown streak running through the whole thing — is that the cocoa doesn’t distribute evenly if you just throw it in the blender with everything else. It clumps. It floats. It does this stubborn little thing where it sits on top of the milk and refuses to cooperate. So. Mix them together first. It takes twenty seconds.
Then put everything into the blender. The ice cream, the milk, the cocoa-sweetener mixture. Blend on medium for about ten seconds. Just ten — you’re not making a smoothie, you don’t want this fully liquid. Then switch to pulse and go until you hit the consistency you’re looking for. I usually do four or five pulses and check. The goal is thick. Spoonable but just barely.
Pour it into a glass. I use a wide glass, not a narrow one, because this is a spoon-then-straw situation and you want room to maneuver. Serve immediately. This is not a make-ahead situation — it starts separating after maybe twenty minutes and then you’re just looking at chocolate milk, which is fine but not what we’re going for.
One thing I’ve done when my blender was being difficult (it’s old, I should replace it, I won’t) is let the ice cream sit on the counter for about four or five minutes to soften slightly. That helped. You could also use slightly less ice cream and a bit more milk if you want a thinner result.

Variations Worth Trying

The Banana extract thing is real, and I’ve done it. About a quarter teaspoon is plenty — more than that and it starts tasting like a banana runts candy, which I do not mean as a compliment. I tried peppermint extract once around the holidays and honestly, that was a good call. Just a few drops. It tasted like a thin mint in frosty form and I was unreasonably pleased with myself.
A version made with heavy cream instead of milk is richer and scoops more like ice cream — good if that’s what you’re after, though I find it a bit much personally.
You can make this more like a chocolate shake by doubling the milk. You can make it more like ice cream by reducing the milk and adding a third cup of ice cream. I’ve also thrown in a handful of ice cubes when I wanted it extra cold — that works, it just thins it slightly.

Storage

There’s really not much to say here. You’re not storing this, ideally. It’s one of those things that needs to be eaten right away.
That said — if you have leftovers, pour them into a freezer-safe container and freeze. Once frozen solid, you’ve got something closer to chocolate ice cream than a frosty. It’s fine. Not magical, but fine. The cookie sandwich idea is genuinely worth doing: two sugar free chocolate cookies, a scoop of the frozen frosty mixture between them, re-freeze for about thirty minutes, eat standing over the sink. That last part is optional but recommended.
I’ve left leftovers in the fridge thinking I’d finish them later and I always regret it. They get watery and strange. Either eat it or freeze it.