Preheat oven to 350 degrees F. Grease two 9 inch spring form pans and set aside.
Whisk together coconut flour, Swerve, baking soda, powder, salt and glucomannan or xanthan gum. Set aside.
To a stand mixer or use an electric hand mixer, add the sour cream, softened butter, heavy cream, lemon extract and stevia and blend until combined. Add one egg at a time until combined. Pour in half the dry ingredients and blend until well combined. Add remaining dry ingredients until nicely incorporated.
Pour cake batter evenly into each cake pan. Bake for 25 -30 minutes or until a toothpick in center comes out clean. Allow to cool 5 minutes then use a butter knife to loosen all around the edges of the cake. Allow to cool completely before removing the sides of the spring form pan.
Filling
Place all the ingredients, except the heavy cream, into a clean bowl or stand mixer and blend until smooth using the paddle attachment. Taste and adjust sweetener if needed. Pour in the heavy cream with the whisk attachment, whisk on medium high until nice and smooth and thickened. Set aside in the refrigerator until the cake is cooked and cooled.
Butter Crumb Topping
Place the dry ingredients into a food processor and process to combine. Add in cold butter. Pulse until crumbs form. Do not over process. Set aside.
Assemble
Place one cake layer on your serving plate. Spread about 3/4 of the filling onto the cake, saving 1/4 of filling for the top layer. Place the second cake layer over the filling. Spread the remaining filling over the top. Carefully using your hands, sprinkle over the crumb topping over the top of the cake and sides, pushing lightly into the cake. Keep refrigerated until ready to serve.
Notes
Net Carbs: 4gThis recipe was published first in January 2020 and updated in April 2021.