Chicken Ratatouille

Ingredients (17)

• + 2 tablespoons olive oil, or as needed add to pantry
• + 3 (10 ounce) chicken breasts, cubed, or more to taste add to pantry
• + ¼ cup thinly sliced red onion add to pantry
• + 1 yellow squash, cut in half lengthwise and into 1/4-inch slices add to pantry
• + 1 green zucchini, cut in half lengthwise and into 1/4-inch slices add to pantry
• + 1 red bell pepper, sliced in 1/4-inch strips and halved add to pantry
• + 6 brown mushrooms, sliced and halved, or to taste add to pantry
• + 6 brown mushrooms, sliced and halved, or to taste add to pantry
• + 3 cloves garlic, or more to taste, minced add to pantry
• + 1 cup chicken stock add to pantry
• + 1 (6 ounce) can tomato paste add to pantry
• ✓ 1 tablespoon herbes de Provence
• + 2 teaspoons ground cumin add to pantry
• + 2 teaspoons dried oregano add to pantry
• + 2 teaspoons celery salt add to pantry
• ✓ salt and ground black pepper to taste
• ✓ salt and ground black pepper to taste