In a large bowl, combine ground beef, ground pork, bread crumbs, Parmesan cheese, garlic powder, onion powder, salt, black pepper, and the egg. Mix until well combined.

Form the Meatballs

Roll the mixture into 1-inch meatballs and set aside on a baking sheet.

Cook the Meatballs

Heat olive oil in a skillet over medium heat. Add the meatballs in batches, cooking for about 8-10 minutes until browned and cooked through. Remove from heat.

Add Pepperoni and Banana Peppers

In the same skillet, add pepperoni slices and banana peppers. Sauté for about 3-4 minutes until heated through.

Combine

Return the cooked meatballs to the skillet and toss gently to combine with the pepperoni and banana peppers.

Serve

Serve hot, garnished with extra banana peppers if desired.