In a saucepan, cook sausage with a splash of olive oil, until browned & cooked through. Set aside.
Add butter to saucepan & saute onions until softened, about 3-4 minutes. Mix in garlic, cook another 2 minutes. Add mushrooms & zucchini, sauteing until tender-crisp, about 5-6 minutes. Return sausage meat to pan & keep warm.
Bring a large pot of water to a boil; add salt. Cook orecchiette pasta according to package directions. Drain pasta & return to pot. Fold in cheese, sausage/vegetable mixture, fresh parsley & pepper to taste. Slowly add chicken broth until preferred consistency is reached. Serve garnished with red pepper flakes & Parmesan cheese.