Sloppy Joe Recipe

Name: Sloppy Joe Recipe
Ingredients: 14 ounce 97% lean ground beef; 4 hamburger buns (split); 3 ounce onion; 1 cup homemade tomato sauce; 2 ounce carrot; 1 ounce green bell pepper; 1 ounce yellow bell pepper; 1 ounce cheddar cheese; 1 tablespoon olive oil; 2 tablespoon unsalted butter; 2 tablespoon Heinz ketchup; 1 tablespoon garlic powder (divided); 1/3 cup unsalted chicken broth; 1/8 teaspoon salt; 1 teaspoon ground black pepper; 1 teaspoon Worcestershire sauce (divided); 2 teaspoon brown gravy mix; 1/2 teaspoon mustard