Remove the stems from the bell pepper and slice creating two hollow pepper halves. Remove the seeds and veins from the peppers. Place in a small baking dish or cast iron skillet.
In a medium size mixing bowl combine the cooked sausage, chopped pepperoni, 1 cup of the mozzarella cheese and the marinara. Stir well.
Spoon the mixture into the peppers, pressing lightly so you can pack the peppers as much as you can.
Top with remaining cup of mozzarella cheese.
Bake 25-30 minutes until the cheese has browned and the peppers are tender.