Preheat your oven to 375°F (190°C).

In a large skillet, heat olive oil over medium heat. Add bell peppers and onions, sauté for about 5 minutes.

In a mixing bowl, combine ground beef, breadcrumbs, egg, milk, Worcestershire sauce, garlic powder, salt, and pepper. Mix until just combined.

Press half of the meat mixture into the bottom of a greased loaf pan.

Layer half of provolone cheese over the meat base, followed by the sautéed veggies.

Top with the remaining meat mixture, sealing the filling inside.

Bake in the preheated oven for 45–50 minutes until firm and internal temperature reaches 160°F (70°C).

In the last 5 minutes, add the remaining provolone cheese on top until melted.

Let the meatloaf rest for 5–10 minutes before slicing.

Slice and serve, optionally garnished with fresh parsley.