FitBake Vanilla Buttercream Frosting Review
I baked the FitBake yellow cake mix and topped it with their vanilla buttercream frosting. Here's how it spread, how it tasted, and the one catch.
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Twenty-five minutes into baking, the kitchen smelled like a real bakery, not a protein-bar approximation of one. FitBake makes a yellow cake mix that’s phenomenal, and the vanilla buttercream frosting is what goes on top: zero added sugars, five grams of protein, 90 calories, and two net carbs on the cake side. For anyone running keto, those numbers are the whole ballgame.
Quick Verdict
Ten minutes of mixing, 25 to 28 minutes at 325, and the whole kitchen smelled divine. The FitBake vanilla buttercream frosting spread on nice and smooth over a loaf-pan yellow cake at 0g net carbs. It tastes pretty sweet, so a thin top layer is all you need.
Buy if you:
- Follow keto or low carb and want a jarred icing you don’t have to whip yourself
- Already bake the FitBake yellow cake mix and want the matching topping
- Want a once-a-week treat instead of a daily dessert habit
- Avoid gluten and artificial sweeteners
Skip if you:
- Don’t like sweet things. It tastes pretty sweet, and I don’t normally eat a whole lot of sweet
- Want to frost the sides too. One jar goes further as a top layer only
- Store your pantry cold.
| Jar size | 8 oz |
|---|---|
| Net carbs | 0g per serving (frosting) |
| Calories | 90 per serving |
| Sweeteners | Monk fruit extract + erythritol |
| Key ingredients | Non-hydrogenated palm fruit, Madagascar vanilla bean |
| Diets | Keto, Atkins, Paleo, gluten free |
The Smell Got Me Before the Taste Did
Stir It. Every Single Time.
Keep the jar at room temperature and stir before you use it. Cold frosting gets stiff and drags across the cake instead of gliding. Mine spread on nice and smooth because it wasn’t chilled. An 8 oz jar goes a long way when you’re only doing a top layer, so one jar outlasts one cake easily. There’s no messy cleanup, no mixer, no powdered sweetener dust all over the counter.
Ten Minutes to Get It in the Oven
Prep took about 10 minutes, start to oven door. There were three different options on the cake mix and I went with the ultra rich one: half cup of sour cream, three eggs, and a teaspoon of oil. I didn’t want to beat it too hard, so just a little mixing, dry ingredients in, then the oil last. Oven at 325 degrees, 25 to 28 minutes, and voila, you got it. If you can measure a half cup of sour cream and set a timer, you can bake this.
The frosting itself needs nothing. Open, stir, spread. That’s the whole process.
The Batter Made More Than I Expected
The mix made 30% more batter than a standard round pan holds; I used a loaf pan instead. I used a loaf pan instead of a full cake pan and it made a small little cake that I really loved, but that’s the gotcha, if you’re planning on a standard round pan, know going in that you may have extra batter sitting in the bowl. If you’re planning on a standard round pan, know going in that you may have extra batter sitting in the bowl. The loaf pan shape also worked out better for the icing, since I only frosted the top and skipped the sides entirely. Less frosting, cleaner slices, and the sweetness stays balanced against the cake instead of overwhelming it.
I’d been pleasantly surprised by this brand’s icing before. This wasn’t my first jar, and that’s part of why I trusted it going into the bake.
How the Vanilla Buttercream Frosting Tasted on the Cake
It tastes like vanilla buttercream frosting, real vanilla flavor, creamy texture, spreads like the real thing, no aftertaste. The frosting is sweetened with erythritol and monk fruit extract, and it tastes pretty sweet, sweeter than I usually go for. I don’t normally eat a whole lot of sweet things, so a thin top layer was exactly right. Any more and it would’ve been too much.
That’s the one real catch. This isn’t a mild icing you slather on. Definitely could not eat one of these whole cakes by myself. But that’s fine, because that’s not what it’s for. This is a once in a week, once every two weeks special occasion thing that I bake for myself when I want to soothe that sweet urging without wrecking the diet.
There’s no aftertaste problem either, which is where most sugar-free frostings fall apart, that lingering cooling sensation erythritol can leave is barely detectable here, almost certainly because the monk fruit softens it. It just tastes like vanilla buttercream frosting, full stop.
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What 8 Ounces of Keto Icing Buys You
One jar covers multiple cakes if you frost tops only. Pricing has been steady for about three months now, so there’s no obvious reason to wait on a dip. It sits around #14,481 in Grocery & Gourmet Food with more than 300 sold in the last month, which for a niche keto icing tells me there’s a steady repeat crowd, not just curiosity buyers. The alternative is making your own keto frosting with powdered erythritol and butter, which I’ve done, and it’s a mixer, a bowl, and 15 minutes you don’t get back.
Buy the Cake Mix With It
Order the yellow cake mix alongside the frosting. They’re built for each other and the pairing is what made this work. If you’re going in on just the frosting, plan on using it over cupcakes, brownies, or cookies, and go light. Store it at room temperature, not the fridge. And if you’re new to erythritol and monk fruit, start with a half batch of frosting on your first cake and see where your sweetness tolerance lands.
Pros
- Spreads on nice and smooth straight from the jar, no mixing or whipping
- 0g net carbs and 90 calories per serving, fits keto and low carb cleanly
- Sweetened with erythritol and monk fruit instead of artificial sweeteners
- Pairs perfectly with the FitBake yellow cake mix I baked at 325 for 25 to 28 minutes
- A little goes a long way, so one 8 oz jar stretches
Cons
- Tastes pretty sweet. If you’ve dialed back sugar, a thin layer is the limit
- Cold storage makes it harder to spread, so pantry temperature matters
- Not enough for a full frost on the sides of a standard cake without a second jar
Frequently Asked Questions
Can I eat the frosting straight from the jar?
Yes, FitBake specifically says a spoonful straight from the jar is fine. At 0g net carbs it won’t move your numbers. I’d still treat it as a treat rather than a habit.
Does it need refrigeration after opening?
Room temperature is the recommended storage, opened or not. Cold temperatures make it noticeably harder to spread. If you do chill it, let it come back to room temp and stir well before using.
Will erythritol upset my stomach?
Some people are sensitive to sugar alcohols in larger amounts. Since you only need a thin layer on a cake, the serving size here is small. Start light if erythritol is new to you.
Does this work on cupcakes and brownies too?
Yes, FitBake lists cupcakes, cookies, and brownies right alongside cakes. I used it on a loaf cake, but the texture is spreadable enough for anything with a flat top. Piping would need a colder, firmer consistency than this is designed for.
Is it gluten free and diabetic friendly?
It’s made with gluten free ingredients and has 0g added sugar with 0g net carbs per serving. The sweeteners are monk fruit extract and erythritol, neither of which spikes blood sugar. Check with your doctor if you’re managing diabetes specifically.
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