In a large bowl, mix together all ingredients - oats, milk, pumpkin, brown sugar, vanilla, baking powder, pumpkin pie spice, salt, and eggs. Mix until well blended.
Spoon batter into the prepared muffin cups, filling each almost to the top. If desired, sprinkle evenly with nuts, craisins, and/or mini chocolate chips
Bake for 25 to 30 minutes or until a toothpick inserted in the center comes out clean.
Cool in the pan for 10 minutes then transfer to a wire rack.
Wrap airtight and refrigerate for up to 2 days or freeze for up to 3 months.
Notes
Nutrition information per serving: Calories: 180; Total Fat: 6 grams: Protein: 5 grams: Carbohydrates: 27 grams; Fiber: 4 grams; Sodium: 185 milligrams