In a 12" oven-safe skillet, heat olive oil over medium-high heat. Add chicken, skin-side down, and brown for 4-5 minutes until skin is crisp. Remove from the pan and set aside on a plate.
Melt the butter in the pan. Add vegetables and toss to coat. Cook for 2-3 minutes until starting to brown. Add garlic and cook for 30 seconds more.
Add Dijon, lemon juice and broth and stir to mix. Season with salt and pepper to taste.
Nestle the chicken thighs, skin side up, on top of the vegetables and transfer the pan to the oven.
Bake 35-40 minutes or until chicken reaches 165°F and vegetables are tender.
Notes
Refrigerate leftovers for 3 days in an airtight container.
Freeze in zippered bags for up to one month. Thaw in the refrigerator before reheating.
Reheat portions of both on the stovetop in a skillet, or in the oven wrapped in foil.