chili mac for a crowd

Ingredients

• 1 box macaroni, elbow (14.5 oz)
• 1 large green bell pepper, diced
• 1 large red bell pepper, diced
• 1 large yellow onion, diced
• 1 tablespoon butter
• 1 tablespoon olive oil
• 2 cloves minced garlic
• 1 package frozen corn
• 2 pounds ground beef
• 2 cans diced tomatoes (no salt added) with juice
• 2 cans chili (with beans)
• 1 can black beans, rinsed & drained
• 3 tablespoons chili powder
• 1 teaspoon black pepper
• 1 package cheddar cheese, shredded