Preheat the oven to 375 degrees. Prepare a muffin tin with cupcake liners and spritz the liners with nonstick cooking spray.
Place all ingredients EXCEPT the nuts into a blender in the order listed. Process the batter until the oats are ground and the batter is smooth. Stir in the nuts, reserving some for topping.
Divide the batter evenly between the 12 muffin cups. Top with remaining nuts.
Bake for 20 minutes or until a toothpick inserted in the middle returns clean.