Meanwhile, in a small pot sauté onion with 1 tablespoon olive oil until translucent, about 2 minutes. Add broth, bring to a boil then add broccoli and cream. Cover and steam until broccoli is thoroughly cooked, about 5 minutes.
Let the broccoli cool down then puree in a blender until smooth, set aside.
Cook pasta according to package directions and drain, reserving 1 cup of pasta cooking water.
Meanwhile, in a skillet sauté sausage with remaining olive oil until thoroughly cooked, add pasta cooking water and pasta, turn off the heat and fold in cheese.
To serve: Place broccoli sauce on the plate topped with sausage penne.
