Heat oven to 400. Lightly spray a 2-quart casserole dish w/ cooking spray. Cook macaroni as directed, drain. In lg saucepan, heat oil over medium heat.
Add onion, garlic and red bell pepper. Cook, stirring for 5 mins. Add tomatoes, ham, broth and oregano. Bring to a boil. Simmer for about 3 mins, or until liquid is reduced some. Stir in macaroni. Season w/ salt and pepper.
Spoon into casserole dish. In small bowl, mix bread crumbs, parmesan cheese and melted butter. Sprinkle over casserole. Place casserole dish on a baking sheet. Bake casserole for about 20 mins, or until browned on top and bubbling.