01 -
Preheat oven to 400°F and lightly coat a baking sheet with nonstick spray.
02 -
Trim a small portion off each end of the squash to stabilize, then slice each horizontally into halves creating four flower-shaped pieces.
03 -
Scoop out seeds and pulp from each half. Rub softened butter inside and on top, then season with salt and pepper.
04 -
Place squash halves cut-side up on the baking sheet and roast for about 50 minutes, or until fork-tender yet firm.
05 -
Approximately 10 minutes before squash finishes, melt remaining butter in a skillet over medium-high heat. Add sausage, apple, onion, and celery; sauté for 5 minutes until sausage is cooked through and vegetables soften. Drain excess fat and season with oregano, salt, and pepper as needed.
06 -
Fill each baked squash half with the sausage and apple mixture. Sprinkle shaved Parmesan on top and serve warm.