Make the Dressing: To a small jar or bowl, add 3 tablespoons extra virgin olive oil, 2 tablespoon balsamic vinegar, 1 teaspoon Dijon mustard, 2 teaspoons honey, ¼ teaspoon salt, and black pepper. Shake or whisk until emulsified.
Assemble the Salad: To a large bowl, add 6 - 8 cups baby spinach, 1 cup strawberries, 1 ripe avocado, ⅓ cup crumbled feta cheese, ¼ cup walnuts.
Dress and Serve: Drizzle with dressing shortly before serving. Toss gently and serve. For extra protein you can add edamame, chickpeas, or chicken.