Keto Lemon Magic Cake

Ingredients

• 5 eggs, room temperature, whites separated from yolks
• 1 teaspoon vanilla extract
• 2/3 cup powdered erythritol
• 1/2 cup unsalted butter, melted
• 1 cup superfine blanched almond flour
• 1/4 cup coconut flour
• 1 3/4 cup unsweetened almond milk, room temperature
• 1/4 cup lemon juice
• 2 tablespoons grated lemon zest