Step 1

Heat the olive oil in a large, deep pan over medium heat. Add the sausage and cook for 4-5 minutes, breaking up the meat with a spatula, until browned.

Step 2

Add the onion to the pan and cook for 3-4 minutes or until translucent.

Step 3

Add 1/2 cup of the pepperoni and the garlic and cook for 1 minute.

Step 4

Add the marinara sauce, water, salt, pepper and pasta to the pot and bring to a simmer.

Step 5

Cover the pot and cook over low heat for 12-14 minutes or until pasta is tender.

Step 6

While the pasta is simmering, preheat the oven to 400 degrees F.

Step 7

After the pasta is finished cooking, sprinkle the cheese over the top and arrange the remaining 1/4 cup of pepperoni on the cheese.

Step 8

Bake for 4-5 minutes or until cheese is melted. Sprinkle with parsley and serve.