Preheat your oven to 375°F (190°C) and lightly grease a muffin tin or a mini loaf pan.
In a large mixing bowl, combine the ground beef (or turkey), breadcrumbs, Parmesan cheese, chopped onion, chopped bell pepper, milk, egg, minced garlic, oregano, basil, and season with salt and pepper. Mix until just combined, being careful not to overwork the meat.
Divide the mixture into 8 equal portions and shape each portion into a small loaf or fill the muffin tin cavities with the mixture.
In a small bowl, whisk together the ketchup, brown sugar, and apple cider vinegar until well combined.
Brush a generous amount of the tangy glaze over the tops of each mini meatloaf. Reserve some glaze for later.
Place the prepared mini meatloaves in the oven and bake for 25-30 minutes or until they are cooked through (internal temperature should reach 160°F or 70°C).
In the last 5 minutes of baking, brush the reserved glaze over the meatloaves for an extra layer of flavor.
Once baked, remove the meatloaves from the oven and let them cool for a few minutes. Serve warm.
Notes
Garnish with fresh parsley and serve with a side of mashed potatoes or a green salad for a complete meal.