1 egg, beaten
1 cup milk
1/4 cup oil
2 cups flour
1/2 cup sugar
3 teaspoons baking powder
1 teaspoon salt
mix-ins of your choice: dried fruit, chopped bananas, chopped apples, chocolate chips, jelly, berries, chopped nuts, jam, butterscotch chips, shredded coconut, or your own idea
Preheat the oven to 400ºF (204ºC).
Line a muffin pan with 12 liners, or grease and flour the pan.
Mix together the egg, milk, and oil in a bowl.
Add the flour, sugar, baking powder, and salt. Mix until just combined. Batter will have some lumps.
Place 1–2 teaspoons of a mix-in in the bottom of each muffin cup. Fill each cup half full with batter. Use a toothpick to stir in the mix-in.
Bake for 20 to 25 minutes. Let cool for 10 minutes, and then remove the muffins from the pan.