Tex-Mex Mac 'n Cheese with Ground Beef, Tomatoes, and Corn

Ingredients

• 1 lb (454 g) ground beef
• 1 tsp salt
• 0.13 tsp ground black pepper
• 1 green bell pepper , chopped
• 1 medium onion , chopped
• 1 package macaroni and cheese dinner, prepared with milk and margarine as package directs
• 1 can (14.5 to 16 oz (454 g)) tomatoes , diced, with liquid
• 1 can (12 oz (340 g)) whole kernel corn , drained
• 1 can (6 oz (170 g)) tomato paste