3 cups torn romaine lettuce leaves
1 cup chopped English cucumber
2 green onions, chopped
1/2 cup chopped yellow bell pepper
1/2 cup chopped red bell pepper
1 large carrot, peeled and sliced thin
1 Granny Smith apple, sliced thin
1 cup fresh blueberries
1/2 cup walnuts
2/3 cup crumbled feta cheese
3 tablespoons apple cider vinegar
2 tablespoons fresh lemon juice
2 teaspoons Dijon mustard
2 teaspoons honey
1/2 teaspoon onion powder
1/4 teaspoon kosher salt
1/2 cup grapeseed oil
2 tablespoons poppy seeds