Place large nonstick pan over medium heat and saute onions and garlic in olive oil and butter. Add in shrimp and cook until just pink. Remove from pan.
Add in red pepper flakes, crushed tomatoes, basil, oregano and cream an simmer lightly for 15 minutes. If you notice the sauce getting a little too thick, feel free to add in a little chicken stock or pasta cooking liquid. Add in salt and pepper, if needed and slide in cooked shrimp.
Toss with hot pasta, top with parsley and cheese and serve immediately.
*add in as much or as little red pepper flakes as you'd like. I liked mine pretty spicy!