Preheat oven to 350 degrees. Make cake mixes as described on the back of the boxes.
Spray whoppie pie tin with baking spray. Fill whoppie pie tin 2/3 full with the white cake mix. Cook 8-10 minutes until toothpick inserted into the center comes out clean. Place on wired rack for 5 minutes to cool. Pop out cakes and let cool completely.
Repeat with the red velvet cake mix.
Next, there will be leftover batter from both cake mixes. Place a little of the red velvet mix into the remaining white cake mix and mix to form a pink cake. You can make this are pale or as dark as desired. I went for a medium pink so the ombre would look more gradual. Fill whoopie pie tin again and bake as previous cakes and let cook.
When cakes are cooling make the frosting, then when cool layer them with the frosting. I liked the red on the bottom, but that's totally up to you. Let then set in the fridge for 30 minutes.
Then, frost them like a regular cake. Taking your sprinkles, very carefully push the sprinkles into the cakes using your hands. This part is tricky, be patient.
Serve and enjoy!