Grease one 9x5" loaf pan, two 7 1/2x4" loaf pans or three 5 1/2x3" loaf pans; set aside. Preheat oven to 350F. In a large bowl, combine sugar, biscuit mix, cinnamon, allspice, and cloves; set aside. In a medium bowl, beat egg. Stir in sourdough starter, pumpkin, raisins, milk, oil and nuts, if desired. Stir into spice mixture until dry ingredients are just moistened. Turn into prepared pan or pans. Bake in preheated oven 35 to 40 minutes for small loaves or 50 to 55 minutes for other loaves. Bread is done when a wooden pick inserted in center comes out clean. Turn out of pan or pans. Cool top side up on a rack. Prepare Golden glaze. Spread on cooled pumpkin loaf or loaves. Makes 1 large, 2 medium, or 3 small loaves. Golden glaze: Combine powdered sugar, half and half and food coloring. Only half of recipe is needed to glaze 1 large loaf.