Preheat the oven to 400F. Grease a 9-by-13-inch or larger baking pan or roasting pan with 1 tablespoon of olive oil.
If you’re using chicken breasts, cut any larger pieces in half. In a small bowl, stir together 1 1/2 teaspoons of salt, 1 1/2 teaspoons of black pepper, the cumin, turmeric, cayenne, lemon juice, and remaining 4 tablespoons of olive oil. Transfer 2 tablespoons of the spice paste to a medium bowl and set aside. Brush or rub the remaining spice paste on all sides of the chicken pieces and set aside on a plate.
Place the carrots, potatoes, sweet potatoes, squash, onions, and garlic cloves in the baking pan. Set aside.
In a bowl, add the chicken broth, remaining 1/2 teaspoon of salt, and 1/2 teaspoon of black pepper to the reserved 2 tablespoons of spice paste and stir until combined. Pour the mixture over the vegetables and toss until combined. Spread out the vegetables into a single layer in the baking pan.
Loosely cover the baking pan with aluminum foil and roast for 30 minutes. Remove the baking pan from the oven and brush or spoon the pan juices over the vegetables, adding more broth, 1 tablespoon at a time, if the pan seems dry.
Place the chicken pieces, skin side up, on top of the vegetables in a single layer. Brush or spoon some of the pan juices over the chicken. Roast, uncovered, for about 50 minutes, basting the chicken and vegetables every 15 to 20 minutes with the pan juices. (Add more broth, 1 tablespoon at a time, if needed.)
Cut into a piece of chicken; it is done when the juices run clear when you cut into the thickest piece. An instant-read thermometer inserted into the thickest part but away from the bone of a chicken piece should read 160F for white meat and 175F for dark meat, when checked a few times over 3 minutes.
Tent the chicken loosely with foil and let rest for at least 10 minutes. Sprinkle with the cilantro, garnish with the roasted garlic (if using), and serve.
Just made this – love the sweetness with zero added sugar. Packed full of flavor!