Blueberry Muffins

1/2 cup butter -- softened
1 cup sugar
2 eggs
2 cups flour
2 teaspoons baking powder
1/2 teaspoon salt
1/2 cup milk
1 teaspoon vanilla
2 cups blueberries -- rinsed and drained

Cream butter and sugar. Add eggs. Add dry ingredients, then milk. Add blueberries last. Bake at 375 degrees for 30 minutes in greased muffin tins.

You can use frozen blueberries, I like those tiny organic ones.