Preheat oven to 350°F (180C). Line an 8 x 8″ baking dish with parchment paper. Tip: first crumble the parchment paper and then smooth it out. It will mold to the dish much easier. Or, spray lightly with cooking spray.
With a whisk, mix all of the wet ingredients in a bowl until combined.
Mix the dry ingredients in a second bowl and add to the wet ingredients. Stir until just mixed.
Spread the batter evenly into the baking dish.
Bake for 30 minutes or until a toothpick or sharp knife comes out clean. It may take a few minutes longer depending on your oven.