Cheese Beat egg until light.Add sugar,sour cream,shortening and mustard; stir well.Add dry ingredients;stir just until moistened;do not overbeat. Gently,stir in ham and cheese.Fill greased muffin tins 0.75 full.Bake @ 400 degrees 20 to 25 minutes.Yield: dozen muffins or 32 mini-muffins.