Carefully cut the squash in half lengthwise. Using a spoon, scoop out the seeds and discard. Place the squash cut side down on a cutting board and cut into slices 1/2 inch thick. Repeat with the remaining squash half. Toss the squash in a bowl with the olive oil, salt and pepper. Spread the squash in an even layer on a baking sheet and roast for 15-20 minutes or until tender.
Transfer the squash to a serving platter. Sprinkle with the pomegranate and pumpkin seeds. Serve immediately.