Set a medium pot of water to boil. Cook shells and cheese according to package instructions. Stir cheese sauce into cooked shells.

Meanwhile, in a large skillet set to medium-high, cook sausage, crumbling with a wooden spoon as it cooks. When almost browned, add diced bell peppers to the skillet. Continue cooking until peppers have softened and sausage is fully cooked, about 5 minutes. Drain off excess grease.

Remove skillet from heat. Add cooked shells and cheese to the skillet and mix well. Sprinkle with chopped green onions, if desired, and serve.

Enjoy!