Directions

Serving Size: 16

FOR THE CAKE:
Preheat oven to 350F degrees. Spray 9 x 13 baking dish with nonstick cooking spray.
In a large bowl, combine ingredients for cake (except melted butter).
While your mixer is running, slowly add the 1/2 cup melted butter. Mix just until combined.
Spread this batter evenly into your baking dish.

FOR THE FILLING:
In a small bowl, combine all your filling ingredients: softened butter, brown sugar, protein, and cinnamon. Stir until combined well.
Drop the cinnamon filling by spoonfuls onto the cake batter.
Take a butter knife and make swirly, marble-effect patterns all around the cake. Drag the knife through both the cinnamon and cake batter.

Bake the cake for about 35-40 minutes, until a knife inserted into the center comes out clean.

FOR THE GLAZE:
Whisk together powdered sugar, milk and vanilla extract in small bowl.
Pour the glaze over the warm cake.