Start by adding your olive oil, lemon juice, salt, pepper, and dijon to a mixing bowl.
Whisk until well combined and divide evenly into 4 jars.
Divide your zucchini up evenly between the four jars, followed by your tomatoes and diced peppers.
Add feta crumbles to each jar, and 1 tablespoon of nuts or seeds to each jar.
Fill the remainder of the way with mixed greens.
Place the lids back on and tightly secure them.
Shake, shake, shake, and enjoy!