Preheat the oven to 400F. Wash the squash, then cut it in half and scoop out the seeds. Cut a little sliver of squash off the rounded side so it sits flat and won't roll around. Place the squash on a foil or parchment-lined baking sheet with the "bowl" facing up.
Sprinkle each half with about 1 teaspoon of apple pie spice or pumpkin pie spice. Then, sprinkle very lightly with sea salt.