Cream butter and sugar. Add eggs one at a time, mixing well after each addition. Add baking powder to batter. Add milk alternately with the flour. Stir in blueberries. Spoon into twelve greased or paper lined muffin cups and sprinkle with a mixture of 2 tablespoons sugar and 1/2 teaspoon of cinnamon.
Bake at 350º for 35-40 minutes.
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