In a large sauce pan or skillet heat olive oil and melt two tablespoons of butter. Then cook the onion and garlic cook until tender and translucent.
Next add the the red pepper flakes and Italian seasoning cook until fragrant (about one minute).
Place the shrimp in the skillet and season with salt and pepper. Cook until the shrimp begins to turn pink.
Add the prepared pasta to the pan and then add in remaining butter, parsley, and parmesan cheese. Stir until the butter and cheese are melted.