An old Southern recipe passed down through my grandmother. You can vary the flavor of gelatin used in order to get a specific color for any holiday, e.g. lime for St. Patrick’s day. You can top this cake with berries, sprinkles, or any topping of your choice.
Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking pan.
Combine cake mix, water, eggs, and oil in a large bowl; beat with an electric mixer on low speed until moistened. Increase speed to medium and beat for 2 minutes. Pour batter into the prepared baking pan.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, 24 to 29 minutes. Let cool completely, at least 30 minutes.
Pour cold water into a bowl. Sprinkle gelatin mix on top. Let stand until softened, about 1 minute. Add boiling water and stir constantly until granules are completely dissolved.
Poke holes all over the cake using a fork. Pour gelatin mix into the holes. Refrigerate cake until gelatin is set, up to 6 hours.
Spread whipped topping over cake.
Per Serving: 310 calories; protein 3.8g; carbohydrates 38.5g; fat 16g; cholesterol 41.6mg; sodium 286.1mg.