Wash your hands and clean your food preparation area.
Wash all produce and fruit before preparing salad.
Using a canning jar, pour in olive oil, zest, and juice of 1 lemon, minced fresh basil, and salt. Cover the jar with lid and shake till blended well, let sit.
Toss spinach and spring mix in a large bowl. Top greens with feta cheese, walnut pieces, blackberries, and sliced peaches.