To assemble your mason jars, start by pouring in 2 tbsp of poppy seed dressing into each jar. Top with ½ cup strawberries, ¼ cup feta, ¼ cup blueberries, and finally 1 cup lettuce. Repeat with the second mason jar.
4 tbsp poppy seed dressing, 1 cup chopped strawberries, ½ cup crumbled feta cheese, ½ cup blueberries, 2 cups spring mix lettuce