Canadian bacon pizza

1 tablespoon vegetable oil
1/3 cup chopped green pepper
1/2 cup chopped onion
1 clove garlic, minced
2 tablespoons chopped fresh parsley
1 10 3/4-ounce can tomato puree
1 teaspoon sugar
3/4 teaspoon dried whole oregano
1/4 teaspoons salt
1/4 teaspoon pepper
Packaged pizza crust for 12-inch pizza
2 cups shredded mozzarella cheese
1 cup shredded Cheddar cheese
1 pound ground pork OR bulk pork sausage
1/4 cup chopped onion
6 ounces Canadian-style bacon
6-8 fresh mushrooms, sliced
1 green pepper, sliced into rings
1/4 cup chopped red pepper

Heat oil in a heavy skillet over medium heat. Add 1/3 cup chopped green pepper, 1/2 cup chopped onion, garlic and parsley; cook, stirring frequently until tender. Add the next 5 ingredients. Bring to a boil; reduce heat and simmer about 30 minutes, stirring occasionally. Spread sauce over pizza crust, leaving a 1/2-inch border around edges. Combine cheeses; sprinkle half of cheese over pizza sauce. Combine ground pork and 1/4 cup chopped onion in a skillet; cook over medium heat until meat is browned, stirring to crumble. Drain well on paper toweling. Spoon half of pork mixture onto pizza. Layer Canadian-style bacon, mushrooms slices and green pepper rings on top of pizza. Sprinkle with the remaining ground pork and chopped red pepper. Bake in a 450 degree F. oven for 10 minutes. Top with the remaining shredded cheese and bake an additional 10 minutes.