From:
https://www.thekitchn.com/how-to-make-stuffed-roasted-squash-cooking-lessons-from-the-kitchn-101662

For each squash (to stuff both halves) prepare 2 to 3 cups filling:

1/2 to 1 cup protein — sausage, chicken, pork, tempeh, or baked tofu
1 to 2 cups vegetables — onions, mushrooms, zucchini, peppers, greens
1/2 cup cooked grains and/or nuts — barley, quinoa, millet, farro,
    rice, walnuts, almonds, pecans 
1/2 to 1 cup shredded cheese
1 to 3 teaspoons herbs or spices

Roast squash halves, cut side down in water in a covered dish, at 375,
until tender. (30 min for large delicatas.)


Cook filling in obvious order.

Rub the inside of the roasted squash with a little olive oil and
sprinkle with salt and pepper.

Cover with aluminum foil and bake 15 to 20 minutes more.