This easy, 20-minute pasta recipe is the love child of Alfredo and Aglio e Olio, delivering a silky, gourmet sauce without a drop of cream. I always  use the butter trick Italians swear by. Watch how the butter and Parmigiano-Reggiano emulsify perfectly with starchy water to cling like velvet to the noodles. Add aromatic garlic and a spicy chilli kick for the ultimate five-ingredient weeknight comfort food. Come on! Does it get any better!