Cut ends off delicata squash and scrape out seeds with a spoon. Slice squash into 1/2-inch rings, then cut each ring into 1 to 2-inch chunks. Spread on first baking sheet in one layer; sprinkle with salt and pepper. Roast for 20 to 25 minutes, until bronzed underneath, then flip and roast for another 10 to 13 minutes, until browned at the edges and tender in the center. Set aside to cool slightly.