Preheat oven to 350 degrees and spray the bundt pan with baking spray
Using a standing mixer, beat together the cake mix, egg whites, butter and milk until combined
Scoop 2 C of the white cake batter into 1 bowl and mix in a few drops of red food coloring
Scoop 2 C of the white cake batter into the 2nd bowl and mix in a few drops of the sky blue food coloring
Pour half of the white cake mix into the bundt pan
Spoon 1 spoonful of the blue batter onto the middle of the white cake batter in the pan
Spoon 1 spoonful of the red batter next to the blue batter
Repeat steps until the middle is filled with red and blue dollops like in the example image
Pour the remaining white batter onto the top
Bake in the oven for 35-45 minutes or until a toothpick comes out clean
Allow to cool completely before removing from pan
Place the bundt cake onto a serving plate
Remove the foil from the frosting and place into the microwave for 30-45 seconds to make the frosting soft and pourable
Once the frosting is soft, pour over bundt cake
Sprinkle red white and blue sprinkles all over the cake
Allow frosting to harden before enjoying!