Add dry ingredients to bowl of wet ingredients and stir until completely combined.
Pour batter into prepared pan and bake for 20 minutes, or until center is set and a toothpick inserted into the center comes out with only moist crumbs.
Let cool in pan for 15 minutes, then transfer to wire rack to cool completely. Cut into 9-16 squares and enjoy!
Notes
Note: Store in an airtight container at room temperature for up to a week.