This is a wonderful make-ahead dish, making it the perfect side to any weeknight meal or holiday celebration. To make ahead, prepare assemble casserole per recipe card up to step 4. Do not bake per step 4, instead cover with foil and place in the refrigerator. When ready to serve, continue with the last two remaining steps on the recipe card, keeping in mind that the dish may need any extra 10 to 15 minutes to warm all the way through in step 4.