Blackberry Muffins

1/2 cup butter
1 1/8 cup sugar
1 cup milk
2 eggs
3 cups flour, divided
3 tsp baking powder
1/2 tsp salt
1 tsp vanilla
pinch baking soda
2 cups blackberries

Preheat oven to 400 degrees. Grease 2 12 cup muffin pans, or use liners. In a large bowl cream butter with sugar and add eggs. Reserve 3 tablespoons of flour and combine the remaining flour with baking powder, salt and baking soda. Combine milk and vanilla. Alternately add the milk and flour mixture to the creamed butter and egg mixutre. Sprinkle reserved flour over berries and gently fold berries into the mixture. Fill each muffin cup 3/4 full and sprinkle tops with sugar if desired. Bake 15 - 20 minutes, until done.