Boil a large pot of salted water. Cook pappardelle as the package says until it's al dente. Save 1 cup of pasta water before draining.
In a big skillet, cook the sausage over medium heat until browned. Break it into small pieces.
Add sliced fennel to the skillet and cook until it's soft.
Stir in Calabrian chili paste and cook for 1 minute.
Pour in heavy cream and simmer until it thickens a bit.
Add cooked pasta to the skillet, tossing to coat with the sauce. Use pasta water if needed to get the right consistency.
Stir in Parmesan cheese and season with salt and pepper.
Serve hot, garnished with extra Parmesan if you like.