2 c. flour
2/3 c. sugar
3 tsp. baking powder
1/2 tsp. baking soda
1 tsp. salt
2 eggs
1 c. milk
1/2 c. butter, melted
2 tbsp. lemon juice
2 c. fresh or frozen whole blueberries, thawed

CRUMB TOPPING:

1/2 c. flour
1/2 tsp. cinnamon
4 tbsp. soft butter
1 c. chopped walnuts

In large mixing bowl mix flour, sugar, baking powder, baking soda and salt. In large measuring cup, combine eggs, milk, butter, and lemon juice. Stir liquid ingredients into dry ingredients until blended. Turn into buttered 13 x 9-inch pan. Sprinkle blueberries evenly over the batter. Sprinkle with crumb topping. Crumb topping: Mix sugar, flour, cinnamon, butter and walnuts until evenly blended and crumbly. Bake at 375 degrees for 40 to 45 minutes. Serve warm.