Preheat your oven to 350°F (175°C).

In a skillet, heat olive oil and sauté chopped red onion and red bell pepper for about 5 minutes until softened.

Combine ground beef, breadcrumbs, Parmesan, eggs, tomato paste, salt, pepper, parsley, and the cooled vegetable mixture in a mixing bowl.

Shape the mixture into a rectangle of approximately 8"x15" on parchment paper.

Layer deli ham, basil leaves, and mozzarella cheese down the center of the meat rectangle.

Carefully roll the meat mixture jelly-roll style, sealing the fillings inside.

Transfer the meatloaf to a baking sheet seam-side down and bake for about 1 hour, until browned and cooked through.

Let the meatloaf rest for 10 minutes covered with foil before slicing.