Mashed Potatoes and Beef Casserole

Ingredients

• 1 pound ground beef
• 6-7 large potatoes
• 1 tablespoon butter
• 1 cup of water
• 1/2 cup tomato sauce
• 1/2 teaspoon ground black pepper
• 1/2 medium red onion
• 1 cup shredded mild cheddar cheese
• 1/2 cup shredded mozzarella cheese
• 2 tablespoons canola oil
• 2 teaspoons salt
• 3/4 cup milk
• 1 teaspoon dried oregano
• 1 large garlic clove
• 1/2 medium green bell pepper