For the meatballs: preheat the oven to 400 degrees. Line a rimmed baking sheet with parchment paper and set aside. In a large bowl, mix together ground chicken, egg, olive oil, garlic, Parmesan, bread crumbs, salt and pepper. Using a tablespoon, scoop meatball mixture and roll into a ball. Place on prepared baking sheet. Continue until you have used all the mixture. You should end up with approximately 32 meatballs.
In another bowl, toss together the crouton ingredients. Spread in a single layer on a rimmed baking sheet. Bake meatballs for 10-12 minutes. Bake croutons for 8-10 minutes.
Meanwhile, divide lettuce between 4 containers. Add desired amount of dressing into a small container.
Once meatballs are cooled, divide evenly among the meal prep containers. Keep croutons in an airtight container at room temperature. Add to the meal prep container the day you are eating it. Store salads in the refrigerator.