Prepare the marinade by whisking the olive oil, Dijon mustard, salt, pepper, garlic powder and oregano in a large bowl.
Add the chicken into the bowl and toss to combine and evenly coat the chicken with the marinade. Refrigerate for 2 hours.
Preheat grill or grill pan to medium heat. Place chicken on the grill for 5-7 minutes. Flip over and cook until golden brown and the juices run dry, approximately 5-7 more minutes.
Remove chicken from the grill and allow to rest for 5 minutes. Slice and divide in the meal prep containers
Divide the hummus, naan, cucumbers and tomatoes between the meal prep containers.
Notes
Storage: The cooked grilled chicken will keep well in the fridge for up to 4 days.