-cheese In large mixing bowl, dissolve yeast in warm milk and water. Add butter, sugar, parsley flakes, salt, garlic powder, egg, and 1 1/2 cup flour. Blend 1/2 minute on low speed, scraping bowl constantly. Beat 3 minutes on high speed, scraping bowl occasionally. Stir in remaining flour and Cheddar cheese until smooth. Cover; let rice in warm place until double, about 40 minutes. (The dough may be refrigerated 2-24 hours before baking.) Heat oven to 350'F. Spread dough in well greased 12" pizza pan or 13x9" baking pan. Arrange SPAM on top of dough, pressing down slightly. Bake 25-30 minutes or until golden brown. Sprinkle Mozzarella and Parmesan cheeses over SPAM. Bake 5 minutes longer or until cheese is melted.