I used the convection bake option on my oven and preheated it to 325. If you don’t have convection just preheat your oven to 350.
Place all ingredients in a blender and blend until smooth (yes, it’s that easy!). If needed, add a little bit of milk or water if the batter is too thick.
Use all of your willpower to not eat the batter.
Spray a nonstick 8″ inch square pan with cooking spray. Pour batter into pan. Sprinkle with cacao or chocolate chips if desired.
Bake about 20 minutes, or until knife comes out clean.