Preheat oven to 350 degrees F. Mix dry ingredients. Cut in 1 stick of butter until crumbly. Set aside one cup.
Add milk, eggs and vanilla to the bigger dry mixture.
Gently stir in berries. Pour into muffin tins. Top with coarse sugar if desired.
Mix melted butter with remaining 1 cup of crumbs. Sprinkle over batter. Bake for 20-30 minutes depending on the size of the muffins.
