These stuffed banana peppers are filled with an Italian sausage mixture and baked in a delicious tomato sauce. We get requests to make this awesome recipe for banana peppers all the time from the guys my husband works with.
Cut off the tops of peppers. Chop edible portions of the tops; set aside. Use a small knife to slice lengthwise through one side of each pepper; remove ribs and seeds.
Bring a large pot of salted water to a boil. Add peppers, reduce heat, and simmer until tender but still firm, about 5 minutes. Drain and set aside.
Heat butter in a medium skillet over medium heat. Sauté reserved chopped pepper, onion, and celery in hot butter until tender, 3 to 5 minutes. Stir in crushed tomatoes, tomato sauce, and garlic. Season with 1 1/2 teaspoons salt, basil, oregano, and 1/4 teaspoon black pepper. Simmer uncovered for 10 minutes.
Preheat the oven to 350 degrees F (175 degrees C).
Meanwhile, combine Parmesan cheese, egg, Worcestershire sauce, 1 teaspoon salt, and 1/4 teaspoon black pepper in a large bowl. Mix in hot sausage, mild sausage, bread crumbs, and 1 cup tomato sauce mixture until well combined.
Fill each pepper with sausage mixture using a piping bag or sausage stuffer. Place in a 3-quart casserole dish; pour remaining tomato sauce mixture over peppers.
Bake uncovered in the preheated oven until sauce is bubbly and sausage is cooked through, about 1 hour. An instant-read thermometer inserted into the filling should read at least 160 degrees F (72 degrees C).