Preheat oven to 400℉. Line an XL rimmed sheet pan with parchment paper.
Veggies:
Toss the cut up 1/2 red onion, bell pepper and broccoli florets with 2 tbs olive oil, salt and pepper to taste. Spread out evenly and bake for 15 minutes.
Meatballs:
Slice your chicken breasts into large chunks - about 2 inches.
Add the onion chunks, garlic, parsley and olives to your food processor and pulse just until broken down (2-3 spins). Add in the chicken pieces, breadcrumbs, egg, olive oil, feta cheese, salt and pepper and pulse until its JUST incorporated. DO NOT OVERMIX. I used an ice cream scooper to keep a uniform shape of meatballs. Meatball portion should be about 2 tablespoons. Nestle them on your pan with the veggies and bake for about 17-19 minutes.
Notes
Use almond flour instead of breadcrumbs to make this meal Gluten Free!