1 tablespoon brown sugar
1 tablespoon ground cumin
1 tablespoon kosher salt
1 tablespoon freshly ground black pepper
1/4 teaspoon cayenne pepper
1 acorn or delicata squash (about 1 1/2 pounds), halved lengthwise, seeded, cut into 1/4″ half moons
1 fennel bulb (about 1/2 pound), cut in half lengthwise, sliced into 1/4″ wedges with core intact
1/2 pound seedless red grapes (about 1 cup)
1 tablespoon olive oil
8 skin-on, bone-in chicken thighs (about 2 pounds)
1/4 cup torn fresh mint leaves

Position rack in upper third of oven and preheat to 425°F. Mix brown sugar, cumin, salt, pepper, and cayenne in a small bowl. Toss squash, fennel, and grapes with oil and half of spice mixture on rimmed baking sheet and arrange in a single layer. Rub chicken thighs with remaining spice mixture and arrange, skin side up, on top of fruit and vegetables. Roast until skin is browned and an instant-read thermometer inserted into the thickest part of chicken registers 165°F, about 35 minutes; if chicken skin or vegetables start to burn, move pan to a lower rack to finish cooking. Divide chicken, fruit, and vegetables among 4 plates and top with mint.