Preheat oven to a 350°F oven. Grease an 8 ounce ramekin with cooking spray.
Add all of the ingredient to a blender and blend until smooth and combined, about 1 minute.
Add the batter to the ramekin. Top with a few chocolate chips if desired. Bake for 20-25 minutes or until a toothpick inserted into the center comes out with just a few crumbs. Let cool for 10 minutes before serving.