Preheat your oven to 350 degrees, and grease or line an 8X8 baking dish.
Mix all of the ingredients together until well combined (fold in any addition add-ins if desired once your batter is mixed well).
Spread the thick batter into your prepared baking dish.
Bake at 350 degrees for 15-20 minutes or until a toothpick comes out relatively clean. Be careful not to bake them too long-- you want them to be moist and fudgy!
Cool and cut into squares. These are amazing topped with ice cream while they're still warm!