I have a couple of solutions that work well. I always spray my paper cups with cooking spray before putting in the batter. Before I add my blueberries to the batter, I coat them with a tablespoon or so of flour. This prevents them from sinking to the bottom and prevents them from "bleeding" into the batter.
By Elaine from Belle Plaine, IA
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Stir together first 3 ingredients with 3/4 teaspoon salt. Combine egg, milk and oil. Add all at once to dry mix. Stir just until moistened.
Beat egg and mix in all ingredients except blueberries. Stir until thoroughly mixed. Fold in blueberries.
Preheat oven to 400 degrees F. Lightly spray muffin tin. Wash blueberries, set aside. In large bowl, add flour, baking powder and 1/3 cup sugar.
Cream shortening and sugar and add eggs 1 at a time. Sift flour, baking powder and salt. Add alternately with milk.
