Preheat the oven to 375°F.
Fill a large pot with 4 quarts water and add the salt. Bring to a boil over high heat. Add the pasta and cook for 8 minutes; it will be underdone. Reserve ¾ cup of the liquid and drain the pasta.
Meanwhile, in a large ovenproof skillet, combine the marinara, roasted garlic, 1 ounce of the chèvre, and the red pepper flakes. Cook over medium heat, stirring often, until the cheese is fully incorporated, about 2 minutes.
Add the pasta to the skillet along with the reserved cooking liquid. Cook over medium heat, stirring to combine, about 2 minutes. Dollop the remaining 3 ounces chèvre all over.
Bake for 15 minutes. Turn on the broiler and cook until the cheese is brown and bubbly, about 2 more minutes.
Top with the parsley and more red pepper flakes. Serve warm.
