Preheat oven 350°
Spray or grease muffin tin (extra large 6 muffins)
In a large bowl mix together butter and sugar until it is creamy.
Add in the salt and baking powder then add eggs, 1 at a time mixing well
Add flour and milk blending together.
Fold in the berries and fill muffin tins
Bake for 30-35 minutes.
If you are using a 12 muffin pan, reduce the time of baking to 15-20 minutes.