In a bowl, sift together flour, baking powder and salt; set aside.
In another bowl cream together, sugar and butter, until light and fluffy Add in egg and egg whites, milk, vanilla and strawberry puree
With your mixer on low, add the flour mixture slowly into the wet ingredients. Mix just until combined. Pour into lined muffin cups and bake for 19-22 minutes, or until toothpick inserted comes out clean.