Prepare macaroni in a Dutch oven according to package directions, omitting salt and fat. Drain and set aside.
Heat pan over medium-high heat. Coat pan with cooking spray. Add beef; cook 3 minutes or until browned, stirring to crumble. Remove beef with a slotted spoon. Add onion and garlic to pan; sauté 2 minutes. Stir in tomato paste, chili powder, paprika, oregano, and tomatoes; cook 2 minutes or until mixture thickens, stirring occasionally. Stir in macaroni, beef, and 3/4 cup cheese; cook 1 minute or until cheese melts. Stir in salt and pepper. Sprinkle 1 tablespoon cheese over each serving.