Preheat oven to 325 degrees. Mix together cake mix, jello, oil, 1/2 cup water and egg whites with hand mixer on medium speed for about 3 minutes. Scrap the sides of the bowl, add in the strawberry puree and food coloring. Mix until combined.
Spoon small amount of batter into mini doughnut tin about 2/3 of the way up. Wipe off excess on sides of mold. Bake for 7-8 minutes until toothpick inserted comes out clean.
Let cool in tin on wired rack for 5 minutes, take out doughnuts and place on wires rack to cool completely. Store in air tight container until ready to serve, before serving sprinkle with powdered sugar.