In a medium-sized bowl, stir together the white cake mix with eggs, yogurt, milk and oil. Mix thoroughly until all ingredients are fully combined. Pour the mix into 3 different bowls, dividing it into 3 equal parts. Add 4-5 drops of food coloring to eat bowl of batter. In the end, you’ll have 3 different colors. Fill 1/3 of each cupcake mold/liner with 1 of the colors, and add additional layers of alternating colors. Repeat until all the batter has been used.