Sugar-Free Low Carb Sponge Cake (Keto, Gluten Free) - Sugar-Free Mom

Ingredients

• 9 eggs (separated)
• 1/2 tsp cream of tartar
• 1/2 tsp vanilla extract
• 1 tsp vanilla liquid stevia
• 1 tbsp lemon zest
• 1/4 cup coconut flour (I used Bob's Red Mill)
• 1/4 cup vanilla protein powder (I used Jay Robbs, 1 scoop)
• 1/2 cup Swerve confectioners sugar- free sweetener
• 1/2 tsp baking soda
• 1/2 tsp salt
• 4 tbsp butter (melted and cooled)
• optional toppings: fresh sugar-free whipped cream and berries