Preheat oven to 325 degrees Fahrenheit.
In a mixing bowl, combine white cake mix, soda and egg white.
Pour mix about 1/2 the way in the cupcake liners.
Add sprinkles. I used about 1 tsp. for each cupcake.
Mix in food coloring of choice until it is the desired color.
Fill cupcake liners to 3/4 of the way full.
Bake according to cake mix instructions.
Let the cupcakes cool, then top with buttercream frosting.
Top with Skittles Sprinkles and serve.