Bring a large pot of salted water to a boil. Add spaghetti and cook until al dente, about 8 to 10 minutes, reserving ½ cup pasta water before draining.

While pasta cooks, combine butter and olive oil in a large skillet over medium heat. Once butter is melted and foaming, add garlic, Italian seasoning and red pepper flakes. Sauté until fragrant, about 1 to 2 minutes.

Add cooked pasta to the skillet. Toss with the sauce, adding reserved pasta water a little at a time until you reach your desired consistency.

Remove from heat and stir in Parmesan, parsley, salt and pepper. Serve immediately.