In a bowl with an electric mixer cream the butter and sweetener until light and fluffy.
Add the yogurt and vanilla and beat until combined. Add the eggs one at a time mixing after each.
Stir in the flours, baking powder, and salt until thoroughly combined.
Divide batter between 4 round cake pans lined with parchment paper and cooking spray.
Bake at 350 for 20-22 minutes until the cake springs back when lightly pressed with your finger and the edges are golden. Cool completely.
Chocolate Frosting
Beat the butter and sweetener until smooth. Add the cocoa powder and half and half. Beat until smooth. Add the yogurt. Use to ice the cooled cake.
Notes
I hope you love this Keto Birthday Cake!If it's your birthday Happy Birthday from me!Nutrition - this cake has 5.2 net carbs per piece.Notes on Sweeteners: