Preheat oven to 400 degrees F.
Line a muffin pan with 12 paper liners and spray lightly with oil.
Stir the ingredients together in a mixing bowl until well combined.
Spoon the batter into the liners, dividing it equally.
Bake for 25 minutes and check for doneness with a toothpick. Bake 5 more minutes if necessary.
Serve warm. Keep leftovers in the fridge in a sealed plastic bag or bowl, or freeze in thick, zipper-sealed freezer bags.