1-First, preheat your oven to 350°F. Begin by heating 2 tablespoons of olive oil in a skillet over medium-high heat, then sauté 1/2 cup chopped yellow onion and 1/2 cup chopped green bell pepper for 5-6 minutes until they soften. Add 3 cloves of minced garlic and cook for another minute before removing from the heat.

2-Next, in a large bowl, scramble 1 large egg. Add 1 pound of 93% lean ground beef, 1/2 cup breadcrumbs, 1/4 cup 2% milk, 2 tablespoons ketchup, 1 tablespoon Worcestershire sauce, 1 teaspoon salt, 1 teaspoon dried parsley leaves, and 1/2 teaspoon ground black pepper to the egg mixture. Once the sautéed vegetables have cooled, mix them in thoroughly by hand, then stir in 4 ounces of mozzarella cheese chopped into 1/2 inch cubes.

3-Transfer the mixture to a 9×13 inch baking dish, shape it into a loaf, and spread the remaining 1/4 cup ketchup evenly on top. Bake for 55 minutes, then let it cool for 10 minutes before slicing into 10 pieces.