Roasted Chicken Thighs With Winter Squash

lemon, ends trimmed, halved lengthwise, seeds removed, and thinly sliced crosswise into wedges

bone-in, skin-on chicken thighs (about 1 and 1/2 pounds)

plus 1 teaspoon extra-virgin olive oil

chopped sage

and 1/2 teaspoons coriander seed

and 1/2 teaspoons kosher salt

black pepper

maple syrup

unsalted butter, cut into cubes

Large pinch chile powder

delicata or acorn squash (1 and 1/4 pounds), seeded and sliced into 1/4-inch-thick rings

thinly sliced scallions, white and light-green parts