Preheat oven to 375 degrees F. Line a muffin tin with cupcake liners and set aside.
Spoon the muffin batter into the muffin liners until they are about 3/4 full. Will make 18 muffins. Sprinkle a spoonful of the crumbs onto the tops of the muffins.
Remove from the oven and allow to cool in the tin for about 5 minutes, then remove to a cooling rack to cool all the way. Serve!