Start with white cake mix, add egg whites, oil, and water according to the box directions. Mix on low to avoid mess, then increase to medium speed for 2 minutes.
Pour the batter into a slightly greased 9 by 13 baking dish and bake at 350°F for about 25 minutes or until a toothpick comes out clean.
Once the cake cools, poke holes in it using a spatula to prepare for the Jell-O.
Mix hot water with strawberry Jell-O until dissolved, then add cold water as instructed on the box.
Pour the Jell-O mixture into the holes in the cake, filling them adequately. Let the cake firm up in the fridge for at least 1 hour, preferably 2.
Spread cool whip evenly over the top of the cake after removing it from the fridge.
Top with blue sprinkles and strawberry pop rocks just before serving so they remain crunchy.