Combine all dressing ingredients in a jar and shake well.
Marinate the chicken in about 1/2 cup of the dressing for several hours or overnight.
Preheat oven to 350˚ and line a large rimmed pan with parchment paper.
Place Brussels, potatoes, peppers and lemon slices in a bowl and add 1/4 cup of the dressing, tossing to coat.
Place veggies and chicken on pan.
Roast 45 minutes.
Add tomatoes, olives, artichokes and remaining dressing to pan.
Roast another 15 mins or until Brussels and potatoes are fork tender.
Enjoy!