Preheat the oven to 350 degrees F (175 degrees C). Grease and flour a 10-inch Bundt pan.

Stir gelatin mix and cake mix together in a medium bowl. Add eggs, oil, water, and vanilla; beat with an electric mixer on high speed for 3 minutes. Pour batter into the prepared pan.

Bake in the preheated oven until a toothpick inserted into the center comes out clean, 35 to 40 minutes. Be careful not to overbake. Cool for 15 minutes in the pan before inverting onto a wire rack to cool completely.