To make this Gingerbread Poke Cake Recipe gluten free, replace the spice cake mix with a certified gluten-free spice cake mix. If a gluten-free spice cake mix is unavailable, use a certified gluten-free yellow or vanilla cake mix and add additional warm spices, such as ginger, cinnamon, nutmeg, and cloves, to taste. Verify that the sweetened condensed milk, molasses, Cool Whip, caramel topping, gingersnap cookies, spices, and all packaged ingredients are labeled gluten free or free from gluten-containing additives. Use certified gluten-free gingersnap cookies for the topping and garnish. Prepare the cake with clean mixing bowls, utensils, measuring cups, and a clean baking pan to prevent cross-contact with gluten-containing ingredients.