Creating delicious Meatloaf Muffins is straightforward. Follow these steps for a perfect outcome:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Prepare a muffin tin by greasing with cooking spray or lining with muffin liners.
2. Prepare the Vegetables: In a skillet, sauté the chopped onion, bell pepper, and garlic until softened. This should take about 3-4 minutes.
3. Mix the Meat Mixture: In a large bowl, combine ground beef, breadcrumbs, egg, milk, sautéed vegetables, ketchup, Worcestershire sauce, Dijon mustard, salt, black pepper, and Italian seasoning. Mix until just combined; avoid overmixing.
4. Fill the Muffin Tin: Spoon the meat mixture evenly into each muffin cup, filling them about 3/4 full. If desired, sprinkle shredded cheese on top for a cheesy finish.
5. Add Toppings: Spread a small amount of ketchup on the top of each muffin for added flavor and moisture.
6. Bake: Place the muffin tin in the preheated oven and bake for 25-30 minutes. The muffins should be cooked through and golden on top.
7. Check for Doneness: Use a meat thermometer to ensure the internal temperature reaches 160°F (70°C) for beef or 165°F (74°C) for turkey.
8. Cool Slightly: Remove the muffin tin from the oven and allow the muffins to cool for about 5 minutes before gently removing them from the tin.
9. Serve: Serve warm and enjoy your delicious Meatloaf Muffins!