Cut ends of acorn squash then cut in half. Scoop seeds out of the center of each half and discard.
Place squash halves on a baking pan and brush olive oil on inside and top of squash. Season with salt and pepper. Bake for 40 minutes.
While squash is baking, cook and crumble sausage in a large skillet over medium heat. Drain excess grease and then add onion, celery and apple. Cook for another 4-5 minutes.
Remove from heat and stir in cheese and Panko bread crumbs. Spoon mixture into the center of each squash. If you like, top with a little extra cheese and bake for an additional 15 minutes.
Remove from oven and serve. Top with pomegranate seeds, optional.