Preheat oven to 400 degrees F.
Place butternut squash halves on a large baking sheet flesh side up.
Place one teaspoon butter in the middle of each squash.
Sprinkle brown sugar over each squash.
Season with salt and black pepper.
Roast 50 to 60 minutes, until flesh, is fork-tender.
Reserve 2 halves for, future meal.