Start by making the Blackberry Vinaigrette. Add all of the vinaigrette ingredients to a mason jar, and seal tightly with a lid. Shake until all ingredients are combined and set aside.
Next, arrange the spring salad greens, radishes, grape tomatoes, avocados, almonds, chicken, blackberries, and feta in a large bowl or platter.
Sprinkle with feta, and top with the Blackberry Vinaigrette. Enjoy!