Preheat the oven to 350 degrees F. Lightly grease a 9x13 inch baking dish and set aside.
Add the cake mix, egg whites, whole milk, melted butter, and sea salt to a large bowl. Use a mixer to combine the ingredients.
Pour the cake batter into the prepared pan and bake for the time listed on the packaging or until cake is golden brown on top and a knife or toothpick inserted in the center comes out clean.
Pour the gelatin mixes into separate bowls. Add 1 cup boiling water to each bowl and stir until the gelatin is dissolved. Once the gelatin has dissolved, add 1 cup cold water to each bowl and stir.
Spoon or slowly pour ¾ cup of each gelatin mix over the cake, alternating the blue and red between rows. *Allow the extra gelatin to set or use for another dessert.
Place the cake in the fridge to chill for at least 3 hours.
Use a mixer to beat together the heavy cream, confectioner’s sugar, and clear vanilla extract until stiff peaks form.
Spread the whipped frosting evenly over the cake and top with sprinkles.