To make the salad, toss together baby kale, grilled chicken, strawberries, blueberries, pistachios, and feta cheese.
To make the dressing, put all ingredients in a mason jar (or whisk in a bowl) and shake until sugar is dissolved. Give it a shake before pouring on the salad.
You can either pour it on the whole salad and toss it all together or serve it on the side so everyone can dress their salad however they wish.