Preheat your oven to 350°F (175°C).

In a skillet over medium heat, add olive oil and heat until shimmering. Sauté chopped red onion and diced red bell pepper for about 5 minutes until soft.

Add minced garlic to the skillet and sauté for an additional minute until fragrant, then remove from heat.

In a large mixing bowl, combine ground beef, Italian style breadcrumbs, grated parmesan cheese, eggs, tomato paste, salt, pepper, parsley, and the sautéed vegetables. Mix thoroughly.

Lay a sheet of parchment paper on your counter and form the meat mixture into a rectangle about 8 inches by 15 inches.

Evenly layer slices of deli ham, fresh basil leaves, and shredded mozzarella on top of the meat rectangle, leaving a 1-inch border.

Using the parchment paper, roll the meat mixture away from you, tucking in the layers as you go. Ensure edges are sealed.

Place the rolled meatloaf seam-side down on a baking sheet lined with parchment paper. Bake for 1 hour, or until it reaches an internal temperature of 160°F (71°C).

Let the meatloaf rest for 10 minutes before slicing and serve topped with marinara sauce.