Preheat grill/oven to 350°.
Wash and trim tops off the banana peppers.
Cut a slit down one side, not cutting all the way through, and remove the seeds.
In a mixing bowl, add in the ricotta, sausage, red pepper flakes, and Italian seasoning.
Stir ingredients well.
Gently stuff the banana peppers with the filling, they can be slightly overfilled.
In a casserole dish pour your spaghetti sauce to cover the bottom and lay the stuffed banana peppers on top.
Cover the dish tight with foil and bake for 55 minutes.
Remove the foil and sprinkle cheeses on top.
Return to the grill/oven, uncovered, and bake for 10 minutes or until the cheese is melted.
Serve when ready.