Sift dry ingred. together. Beat eggs in a separate bowl. Add butter and milk to the eggs. Combine the liquid and the dry ingred. with a few strokes. Fold into the batter, before the dry ingred. 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.