This recipe comes from here: Pittsburgh-style Stuffed Banana Peppers Recipe
I originally had a recipe from a newspaper, I think it was the Pittsburgh Post Gazette. I remember it made a huge portion. I can't seem to find it. It was a digitized article from the 90s.

I haven't made it from this recipe yet. I will modify it with what I do when I make it.

12-16 banana peppers, the hot kind
1/8 lb each: hot sausage, ground veal, ground beef (I don't use veal)
1 egg
1 1/2 t garlic, minced
1 T fresh basil, minced
1/4 c seasoned breadcrumbs
1/4 c freshly grated parmesan
salt and pepper to taste
1 T. olive oil
1 c. of your favorite marinara

Cut tops off peppers and remove the seeds. In a bowl, gently mix the meats with egg, garlic, basil, the breadcrumbs, and cheese. Season with salt and pepper and mix well again. Stuff the mixture into the peppers, forcing the meat to the end of each.

Preheat oven to 350.

Heat olive oil in a skillet and brown the peppers lightly on all sides. Transfer to a shallow casserole, top with marinara and bake until the meat is cooked through.