Medium White Sauce (makes 2 1/2 cups) Melt 4 tablespoons butter in saucepan over low heat. Blend in 4 tablespoons flour, 1/2 teaspoon garlic salt (regular salt is fine too!) and a dash of fresh ground black pepper . Add, all at once 2 cups of half and half or whipping cream. Cook quickly, stirring constantly with a a silicone spatula or a whisk until mixture thickens and bubbles. At this point, it's finished, you're making cheese sauce, such as for (Au Gratin potatoes) add 2 cups shredded sharp cheddar cheese, stirring to melt the cheese.