Crispy Pork Tenderloin Sandwiches

In a shallow bowl, mix flour, salt and pepper. Place egg in another shallow bowl. Combine bread crumbs and place in a third shallow bowl., Cut tenderloin crosswise into 4 slices; pound each with a meat mallet to 1/4-in. thickness. Dip in flour mixture to coat both sides; shake off excess. Dip in egg, then in crumb mixture, patting to help adhere., In a large skillet, heat oil over medium heat. Cook pork 2-3 minutes on each side or until golden brown. Remove from pan; drain on paper towels. Serve in buns, with toppings as desired.