1. Preheat your oven to 375°F (190°C) and lightly grease a loaf pan.
2. In a large skillet, heat olive oil over medium heat. Sauté the onions, bell pepper, and garlic until softened, about 5 minutes. This step always reminds me of helping my abuela in the kitchen, learning the magic of combining simple ingredients.
3. In a large bowl, combine the ground beef, ground pork, sautéed vegetables, breadcrumbs, eggs, Worcestershire sauce, Dijon mustard, salt, and black pepper. Mix gently with your hands until just combined — overmixing can make the meatloaf tough.
4. Press half of the meat mixture into the prepared loaf pan. Layer the cheese slices on top, then cover with the remaining meat mixture, sealing the edges to enclose the cheese.
5. Spread ketchup evenly over the top of the meatloaf. This glaze adds a sweet tangy flavor that balances the savory meat perfectly.
6. Bake in the preheated oven for 50-60 minutes, or until the internal temperature reaches 160°F (71°C). Let it rest for about 10 minutes before slicing.

Every step of this recipe carries the essence of family and tradition, allowing you to cook with love and care.