Nonstick cooking spray or butter, for greasing the baking dish
Two 12-ounce bags frozen mixed berries
1 box yellow cake mix
1/3 cup finely chopped walnuts
1/3 cup rolled oats
1 stick (8 tablespoons) unsalted butter, melted
Ice cream or whipped cream, for serving
Four days of eating, drinking and all your favorite chefs.