Fill a large saucepan with water for the pasta and set to boil. Add plenty of salt (well-salted pasta water is the secret to life). When the water boils, add the pasta and cook to package instructions (mine was for about 6 minutes).
While the water boils, melt the butter in a large saucepan or skillet over medium heat. Sauté the garlic until fragrant, about a minute. Add the peas and cook about 3-5 minutes more, until tender. Add the cheese, heavy cream, and black pepper, and stir to combine until the cheese is melted. Let thicken slightly, then turn to low to keep warm until your pasta is done.
When the pasta is finished cooking, remove from the water with tongs and transfer the noodles to the skillet or pot that contains the sauce. Toss the sauce with the noodles, adding a small amount of pasta water if the sauce is too thick. If it is too thin, add more cheese to thicken it. Serve with freshly grated Parmesan on top, and red pepper flakes. Enjoy!