Preheat the oven according to the cake mix package directions.

Prepare 1 white cake mix according to the package instructions, including the required eggs, oil, and water.

Divide the prepared batter evenly among 3 mixing bowls.

Leave one bowl plain white.

Add red gel food coloring to the second bowl and stir until you achieve a vibrant red color.

Add blue gel food coloring to the third bowl and stir until you achieve a vibrant blue color.

Spray a Bundt pan thoroughly with non-stick cooking spray.

Pour the red batter into the bottom of the pan and spread evenly.

Carefully layer the white batter over the red batter.

Finish by spreading the blue batter on top.

Bake according to the cake mix package directions.

Allow the cake to cool completely, then invert onto a serving platter.

Place the white candy melts in a microwave-safe bowl and microwave in 30-second intervals, stirring between each interval, until smooth.

Spread the melted white candy melts over the cake as a coating.

If desired, add a layer of sprinkles.

Melt the red and blue candy melts separately using the same microwave method.

Transfer each color to a piping bag or zip-top bag with a small corner snipped off.

Drizzle the red and blue candy melts over the cake to create a firecracker effect.

Add additional sprinkles if desired.

Allow the candy coating to cool and harden before slicing.

Serve and enjoy!