1. Heat oven to 375 degree F. Line twelve 3-inch or fourteen 2-1/2-inch muffin-pan cups with paper liners.
2. Combine flour, baking powder, and salt in a bowl. Beat butter and 1 cup sugar in a large mixer bowl at medium speed until light and fluffy. Add eggs one at a time, beating well after each addition. Add dry ingredients alternately with milk and vanilla, beginning and ending with dry ingredients, until batter is smooth.
3. Crush 1/2 cup berries and add to batter. Fold remaining berries into batter with rubber spatula. Divide and spoon batter into muffin-pan cups. Sprinkle with remaining 1 tablespoon sugar. Bake 30 minutes or until toothpick inserted in center comes out clean. Cool muffins in pan 5 minutes, then remove from pans onto wire rack. Makes 12 muffins.