Preheat oven to 425 F.
Line sheet pan with foil and coat with non-stick spray. Spread squash pieces in single layer over foil. Season with salt. Top with apple pieces. Dot with butter. Spread with sage leaves. Dust with cinnamon.
Bake at 425 F until tender and browning, approx. 20-25 min. Serve with additional salt and/or cinnamon as desired.