Heat the oven to 400 degrees.
Cut the peppers in half lengthwise, remove the seeds and hollow them out.
Place the peppers into a well greased 9x13 baking dish, and bake for 15 minutes.
While the peppers are baking, saute the Italian sausage in a skillet over medium high heat until cooked through. Drain the excess fat.
Pour the marinara in with the meat, stir to combine and set aside.
In a mixing bowl, blend together the ricotta, cottage cheese, 1 cup of the mozzarella, Italian seasoning, garlic powder, egg, parmesan cheese and salt and pepper to taste.
Remove the peppers from the oven, and dump out any moisture that make have accumulated in them.
Spread a spoonful of the cheese mixture into the bottom of each of the pepper halves.
Top the peppers with the meat mixture.
Sprinkle with the remaining mozzarella cheese.
Bake for another 15-20 minutes, or until the peppers are tender.