My father-in-law took one bite and came running over to me asking for this recipe

Preheat oven: Preheat your oven to 375°F (190°C). Lightly grease a 9×5-inch loaf pan.
Sauté vegetables: In a large skillet, heat olive oil over medium heat. Add chopped onion, green bell pepper, mushrooms (if using), and garlic. Sauté until soft and fragrant. Remove from heat and let cool slightly.

Prepare meatloaf mixture: In a large bowl, combine ground beef, eggs, breadcrumbs, Worcestershire sauce, ketchup, garlic powder, onion powder, oregano, salt, and pepper. Add sautéed vegetables and mix until combined.
Assemble meatloaf: Press half of the meatloaf mixture into the prepared loaf pan. Sprinkle with shredded provolone cheese, then top with remaining meat mixture. Press down firmly.
Bake meatloaf: Place meatloaf in the preheated oven and bake for 45-55 minutes, or until the internal temperature reaches 160°F (71°C).
Add cheese topping: Once meatloaf is fully cooked, remove from the oven and place slices of provolone cheese on top. Return to the oven and bake for 5-7 minutes until cheese is melted and bubbly.
Serve: Allow meatloaf to rest for 5-10 minutes before slicing. Garnish with fresh parsley if desired and serve hot. Enjoy with a side of mashed potatoes or a simple green salad.