Bring a large pot of salted water to a boil over high heat.
Add the pasta and cook until a bit shy of al dente according to the package directions.
Add the broccoli rabe 3 minutes before the pasta is done.
When the pasta is al dente and the broccoli rabe is vibrant in color, drain.
Meanwhile, in a separate large pot, heat the olive oil over medium heat.
When the oil is shimmering, add the sausage and garlic, and cook, breaking up the sausage with a wooden spoon until it is cooked through and the garlic is beginning to brown, about 6 minutes.
Add the pasta and broccoli rabe to the sausage.
Season with a generous pinch each of salt, black pepper, and pepper flakes, plus a drizzle of olive oil to help everything come together.
Remove the pot from the heat and serve with plenty of Parmesan alongside for sprinkling.
