• Preheat oven: Preheat the oven to 350 degrees F (175 degrees C).
• Place the squash cut side down into a baking dish.
• Pour water into the dish to about 1/4 inch deep.
• Bake: Bake in the preheated oven until the squash pierces easily with a fork, about 30 minutes.
• Prepare lime butter: Meanwhile, blend the butter with the lime juice and chili powder in a small bowl.
• Mix in the lime zest, if desired.
• Season to taste with salt and pepper.

Serve:

• Spoon the butter mixture into the cooked squash, and serve immediately.