Brown Butter Oatmeal Cookies with Cranberries, Pistachios, and White Chocolate

True life: I’m in love with brown butter, or if you want to be fancy, beurre noisette.¬†For those of you who have ever browned butter before, you already know the wonderful nutty, caramel magic that happens when you take regular ‘ol butter and cook it until the milk solids begin to brown. For those of…