Preheat the oven to 350 degrees.
Start by separating the cake mix into 3 separate mixing bowls. Based on the grams it should be about 173g each. I found there was slightly more mix in the package.
Make the white batter first by adding 150g of yogurt to the mix. Beat on medium speed about a minute. The batter will be thick.
150 g of Fat Free Yogurt, 1 Box of Store Bought White Cake Mix
Next, puree the blueberries in a blender or Magic Bullet. I used the bullet, adding a splash of water just to get them started. Add the pureed blueberries to the next bowl of mix. Beat on medium speed about a minute. The batter will be thick.
150 g of Blueberries
Next, puree the raspberries. If you are using from frozen, there should be enough liquid to blend. Add the pureed raspberries to the final bowl of mix. Beat on medium speed about a minute.
150 g Frozen Raspberries defrosted
Now the layering begins. We started with red for most of them, but next time I will start with the blue. The blue doesn't seem to rise as nice as nice as the red. Plus the red makes a prettier cupcake on top.
Regardless, start layering the batter by adding each batter in order, filling the cup a little less than ⅓ of the way. Here's a few pictures of us making them…
Add sprinkles if you like.
Sprinkles
Bake for 20-24 minutes.
Let cool for at least 5 minutes. We had a hard time waiting.