3 1/4 cups all-purpose flour
1/2 teaspoon baking powder
1 cup white sugar
1/2 cup butter, softened
1/2 teaspoon vanilla extract
Preheat oven to 375 degrees F (190 degrees C). Grease muffin cups or line with paper muffin liners.
Sift together flour, baking powder and sugar; set aside.
In a large bowl, cream together the butter or margarine, sugar and vanilla until smooth. Beat in the eggs and milk slowly, then stir in the flour mixture just until incorporated. Mix in the flour mixture just until. Fold in the sprinkles of softened margarine. Spoon batter into prepared muffin cups.
Bake in preheated oven for 15 to 18 minutes, or until a toothpick inserted into center of white muffin comes out clean. Allow to cool on a rack.