Heat 1 tbsp oil in a large skillet over medium-high heat.
2 tbsp olive oil
Season chicken with salt & pepper and sear 3–4 min per side until browned. Set aside.
2 lb chicken thighs, ½ tsp salt, ½ tsp black pepper
Reduce heat to medium. Add remaining oil, onion, and pepper. Cook for 4–5 minute. Add garlic, and cook for an additional 1 minute.
1 medium onion, 1 bell pepper, 3 cloves garlic
Pour in broth, scraping up browned bits. Add tomatoes, mushrooms, zucchini, Italian seasoning, and balsamic. Simmer 10–12 minutes uncovered.
¾ cup chicken broth, 28 oz tomatoes, 8 oz mushrooms, 1 small zucchini, 2 tsp Italian seasoning, 1 tbsp balsamic vinegar
Nestle chicken back into sauce. Cover partially and simmer for 15–20 min until cooked through.
Stir in green olives during the last 5 minutes of cooking.
2 tbsp green olives
Finish with fresh herbs, chili flakes or a squeeze of lemon if desired.