Sift dry ingredients. together. Beat eggs in a separate bowl. Add butter and milk to the eggs. Combine the liquid and the dry ingredients. with a few strokes. Fold into the batter, before the dry ingredients. are completely moist--either the blueberries or the cranberries. Fill well greased muffin pans 2/3 full and bake in a 400 degree preheated oven for 20-25 min.