Ingredients 
4 tbsp. unsalted butter
3 cups blueberries
2 cups flour
2 1/2 tsp. baking powder
1/2 tsp. salt
3/4 cup milk
2/3 cup granualted sugar
2 large eggs
2 tbsp. sugar mixed with 1/4 tsp. ground nutmeg for topping 
 

Directions
  
Heat oven to 350 degrees. Grease an 8" or 9" square glass baking dish. Melt butter in a saucepan. Let cool. Wash and drain blueberries; spread them out on paper towels to dry. (If frozen berries are used, you don’t have to thaw or rinse them.)

Put flour, baking powder and salt into a large bowl. Stir to mix well. Add milk, sugar and eggs to butter. Whisk to blend well. Add to flour mixture, stirring to blend well. Fold in blueberries. Spread batter in baking dish. Sprinkle with topping.

Bake until a wooden pick inserted in center comes out clean, 50 to 60 minutes. Place dish on wire rack to cool at least 30 minutes before serving.