Preheat oven to 350 degrees. Boil a large pot of water, preferably a Dutch oven and add a small amount of salt (optional.) When the water comes to a rolling boil, add shells and cook according to package directions, minus 1 minute. Drain and rinse with cold water immediately. Transfer to a paper towel lined cookie sheet with shells placed upside down to drain excess water.
While shells are boiling, brown sausage in a large skillet over medium-high heat. Cook for 5 minutes, or until brown, breaking up with a spatula or spoon. Remove sausage to a paper towel-lined plate to drain excess grease. Add olive oil, bell peppers, and onion to the same hot skillet. Saute for 5-7 minutes or until soft. Transfers to a mixing bowl.
Add browned sausage, Italian seasoning and 1 cup shredded Italian cheese to bell pepper mixture. Toss to mix.
Spread a few spoons of marinara sauce in the bottom of a 9x13 dish. Carefully fill each pasta shell with sausage mixture and place into the dish, fitting tightly so they are upright. Cover with remaining marinara sauce and 1 cup shredded Italian cheese.
Bake uncovered for 15 minutes. Remove and allow to cool for a few minutes before serving. Enjoy your Sausage and Peppers Stuffed Shells!
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