Cut squash in half, remove seeds; place halves cut-side down in microwave-safe dish filled with ½ inch of water. Microwave on high for about 12 minutes until squash is tender; drain.
Meanwhile, cut steaks into strips and cook as directed on package, cooking onion and red pepper along with the steaks. Spoon steak mixture into squash halves. Serve drizzled with maple syrup.