How to Make It
Cook the pasta according to package directions. Reserve 1/4 cup of the cooking water, drain the pasta, and return it to the pot.
Meanwhile, heat 1 tablespoon of the olive oil in a skillet over medium-high heat. Add the sausage and cook, crumbling with the back of a wooden spoon, until it's browned and cooked through, about 10 minutes. Transfer to a plate.
Wipe out the skillet and heat the remaining 1/2 cup of oil over medium heat. Add the bell pepper and cook, stirring occasionally, until tender, 3 to 4 minutes. Add the garlic and cooked sausage and cook, stirring, for 30 seconds.
Add the pasta water, red pepper, salt, and parsley and bring to a boil. Toss with the cooked pasta.