Adult Margarita Cake

Preheat oven to 350 degrees. I a large mixing bowl, blend all cake ingredients together until smooth. Pour cake batter into a greased (Cooking Spray) 13X9X2 baking pan. Bake at 350 degree oven for 30-35 minutes and the cake is done. (To test for doneness, insert a wooden toothpick in the center; if it comes out clean, the cake is done) Let cake cool completely, about two hours. To make the topping: Dissolve the Jell-O powder completely in boiling water, then add in the Grand Mariner and Tequila; mix well. Poke holes over cake with a straw. Drizzle Jell-O mixture over entire top of cake. Refrigerate cake for 2 or more hours until ready to serve. Just before serving, top cake with Cool Whip topping and top with lime zest and lime garnish.