Preheat oven to 375'. In large skillet, brown ground beef; drain. Stir in hot macaroni, 1/2 can of french fried onions, 1/2 cup cheese, soup, tomatoes, red pepper and seasoned salt. Mix well. Pour into 2-quart casserole dish. Bake covered, at 375' for 30 minutes or until heated through. Top with remaining cheese and onions. Bake, uncovered for 3 minutes or until onions are golden brown and cheese is melted.