In medium bowl, combine flour, baking powder, baking soda, cinnamon, nutmeg, and salt; set aside. In large mixer bowl, cream butter and sugars. Add eggs; beat until light and fluffy. Blend in pumpkin, milk, and orange zest. Add dry ingredients; mix well. Stir in chopped fruits. Spoon mixture into greased 2 1/2-inch muffin cups, filling 3/4 full. Bake in preheated 350F oven for 25 to 30 minutes, or until toothpick inserted in center comes out clean. Immediately remove from pans; cool on wire racks. Drizzle frosting. Makes 20 small cakes.