Keto Strawberry Cake

I roast fresh strawberries before they go anywhere near this batter, and that single step is the reason it works. Every keto cake I’ve tried with raw berries or strawberry extract has the same problem: it tastes pink, not strawberry. Roasting at 350 for 10 minutes concentrates the juice and deepens the flavor so much that six readers have told me their non-keto families couldn’t tell the difference.

The base uses almond flour and coconut flour together. I tested each one solo early on: almond flour alone makes the cake too dense, coconut flour alone soaks up all the moisture and crumbles apart. The combination is the closest I’ve gotten to traditional cake texture without any wheat flour. A quarter cup of sour cream goes in with the eggs, something I started adding after my first few batches came out too dry. That little bit of sour cream adds moisture without weighing down the crumb.

The texture is spongy and tender, not gummy or overly dense the way a lot of gluten free cakes turn out. I slice it into 9 squares and it cuts cleanly without falling apart. Each slice comes in around 4-5g net carbs depending on your sweetener, which makes it easy to fit into your macros. My family asks for this one by name, and they don’t request most of the recipes I test.

The frosting is cream cheese and butter whipped with the remaining strawberry puree. It has this slightly jammy quality that I love, and it sets up beautifully after an hour in the fridge. I spread it on thick because a cake like this can handle it. If you want a lighter option, a simple whipped cream topping works well too, similar to how I top my keto strawberry shortcake.

I bake this as a sheet cake in an 8×8 pan, but you can also pour the batter into a round pan for a birthday cake presentation. The batter is forgiving and holds its shape in either format. For more strawberry ideas, my strawberry rhubarb cake uses a similar flour base with a tart twist, and my chocolate cake is the one I reach for when I want something richer.

One thing I learned from a reader is that the strawberry puree improves overnight. Roast the berries the day before, refrigerate the puree, and the flavor concentrates into something deeper. I’ve started doing this myself, and the difference is noticeable. It gives you a natural stopping point if you want to break the recipe into stages.

This recipe comes down to one step most people skip: roast the strawberries first. That concentrated puree is what separates this from every other sugar free strawberry cake that just tastes like pink almond flour.

1. Roast fresh strawberries at 350 degrees with sweetener and salt for 10 minutes.
2. Puree the roasted berries until smooth. Reserve some for the frosting.
3. Whisk dry ingredients (almond flour, coconut flour, baking powder, salt).
4. Cream butter and sweetener until fluffy, then add eggs, sour cream, puree, and vanilla.
5. Combine and bake at 325 degrees for 33-35 minutes.
6. Frost with cream cheese, butter, powdered sweetener, and the reserved puree.

Key ingredients

• Fresh strawberries – Fresh gives you the best flavor, especially in season. I’ve used frozen in a pinch (thaw completely and drain the excess liquid), but roasted fresh berries have a depth that frozen can’t match.
• Almond flour + coconut flour – I use both. Almond flour alone makes the cake dense; coconut flour alone absorbs too much liquid. The combination is the closest to traditional cake texture I’ve gotten without gluten.
• Powdered sugar free sweetener for the frosting – This matters. Regular granulated won’t dissolve into the frosting and leaves it gritty. I had a reader make a second trip to the store because my original list didn’t specify powdered, so I updated the recipe. For the batter, regular granulated works fine. I use Lakanto or Truvia Sweet Complete.