Preheat oven to 375 F
In medium sized bowl, combine flour, baking powder and salt.
In a separate bowl, cream the butter and sugar.
Add the eggs, one at a time. Mixing after each.
Slowly stir in milk.
Pour liquid into dry ingredients.
Stir just until moistened. Fold in the berries.
Bake for 25 - 30 minutes in a greased muffin tin or use paper muffin cups.