This flavorful chicken dish is stuffed with pepperoni and cheese, and then baked to perfection. To make this dish, you'll need 4 boneless, skinless chicken breasts, 1/2 cup of chopped pepperoni, 1/2 cup of shredded mozzarella cheese, 1/4 cup of grated Parmesan cheese, 1/4 cup of breadcrumbs, 1 egg, and 1 tablespoon of olive oil. Preheat your oven to 375 degrees. Cut a pocket into each chicken breast, and stuff with the pepperoni and cheeses. Secure the pockets with toothpicks. In a shallow dish, beat the egg. In another shallow dish, mix the breadcrumbs and Parmesan cheese. Dip each chicken breast into the egg, and then coat with the breadcrumb mixture. Heat the olive oil in a large skillet over medium-high heat. Add the chicken breasts, and cook for 2-3 minutes on each side, or until golden brown. Transfer the chicken to a baking dish, and bake for 20-25 minutes, or until cooked through. Serve hot and enjoy!