Preheat your oven to 350°F (175°C). Lightly grease a muffin tin or mini loaf pan with cooking spray or olive oil.
In a large mixing bowl, combine the ground beef (or turkey), breadcrumbs, grated Parmesan cheese, milk, and beaten egg. Use your hands or a spoon to mix until everything is well incorporated and uniform in texture.
Add the finely chopped onion, minced garlic, and bell pepper to the meat mixture. Stir to combine, ensuring the veggies are evenly distributed throughout the mixture.
Mix in the ketchup, Worcestershire sauce, dried Italian herbs, and season generously with salt and pepper, ensuring all ingredients are evenly blended.
Spoon the meat mixture into the prepared muffin tin or mini loaf pan, filling each mold about three-quarters full. For added flavor and moisture, top each mini meatloaf with a small dollop of ketchup.
Place the pan in the preheated oven and bake for 25-30 minutes, or until the mini meatloaves are cooked through and the tops are golden brown.
Once baked, remove the pan from the oven and let the mini meatloaves cool for about five minutes. Carefully remove them from the molds, using a small spatula if needed.
Notes
Garnish with fresh parsley and serve with dipping sauces for added flavor.