In a large bowl, cream butter and sugar until light and fluffy, 5-7 minutes. Beat in egg. Beat in milk. Combine the flour, baking powder, salt and nutmeg; add to creamed mixture just until moistened.
Fill greased miniature muffin cups two-thirds full. Bake at 350° for 14-16 minutes or until a toothpick inserted in the center comes out clean. Cool for 5 minutes before removing from pans to wire racks. Dip muffins in melted butter, then roll in cinnamon-sugar. Serve warm.
Cinnamon Sugar Mini Muffins Tips
How can you make these mini muffins regular-size?
Just fill regular-size muffin tins about 2/3 full with batter and bake at 350°F for 18-20 minutes. Or make this cinnamon muffins recipe instead.