The people have asked for buttermilk recipe ideas, and Richard Blais has spoken—use up that quart to make this easy, creamy buttermilk ranch dressing.
Pro Tip: Richard doesn't shake up his carton of buttermilk before use, especially if it's been sitting in his refrigerator for a while, because he likes to use the top, thickened part, which is great for making sauces like his buttermilk ranch dressing.
Try using this with Chef Blais' schnitzel recipe (made with another recently trending ingredient search term: ground pork), as a dipper for baked chicken fingers, or of course as a dressing over Rach's Whisky Chicken Salad.
Place ingredients in a mason jar or covered container and shake vigorously to combine.