Duncan Hines Holiday Mega Cookie SHOP NOWDuncan Hines’ Mega Cookie line comes in a variety of flavors and each box includes the mix and 6-inch pan, so baking really couldn’t be more simple. And that’s where the Duncan Hines Holiday Mega Cookie comes in. As with the other varieties, the holiday mix comes with a 6-inch pan, so you’re there. All you have to do is stir the sugar cookie mix with water and melted butter, spread the batter in the pan, and top with the red and green tree-shaped sprinkles. You can find the Duncan Hines Holiday Mega Cookie at Walmart for $2.50.