1 ounce reduced-fat feta cheese, crumbled (about 1/4 cup
Combine 1 tablespoon oil, vinegar, honey, thyme, 1/4 teaspoon pepper, and 1/8 teaspoon salt in a medium bowl; stir with a whisk. Add 1 cup strawberries, tossing to coat. Let stand at room temperature 10 minutes.
Divide spinach, remaining 1 cup strawberries, and onion between 2 plates. Top evenly with chicken slices and strawberry-balsamic mixture. Top each serving with 1 1/2 tablespoons pecans and 2 tablespoons cheese.