Preheat oven to 400 degrees.
Using a knife, cut a vertical slit down the center of each sausage. Only go halfway through.
Unwrap each cheese stick and stuff each cheese stick into the slit of the sausages.
Pour ¼ cup marinara sauce to the bottom of a square baking dish. Add stuffed sausages. Top with remaining marinara sauce. Sprinkle on Italian seasoning if using.
Cover with aluminum foil and bake at 400 degrees for 40 minutes or until sausage is cooked through.
