Preheat oven to 375 degrees F. Grease 18 ½ cup muffin cups.
Using an electric mixer, cream butter and 1 ¼ cups sugar in a large bowl until light. Add eggs 1 at a time, beating well after each addition.
Sift flour, baking powder, and salt into a small bowl. Mix dry ingredients into butter mixture alternately with milk. Fold in berries.
Divide batter among prepared cups. Sprinkle 4 teaspoons sugar on top of the muffins. Bake until a cake tester inserted in centers comes out clean, about 30 minutes.
Note: This can be made with any berry you have available, especially blueberries.
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