Sloppy Joe Casserole

Ingredients

• 1 lb ground beef
• 1 small onion, finely chopped
• 1 green bell pepper, finely chopped
• 1 red bell pepper, finely chopped
• 1 clove garlic, minced
• 1 can (14.5 oz) petite diced tomatoes
• 1 cup ketchup
• 1 tbsp brown sugar
• 1 tsp yellow mustard
• Salt
• black pepper
• 2 cups frozen whole-kernel corn
• 1 package (16 oz) penne pasta
• 1 ½ cups shredded Colby-Jack cheese