butternut squash mac and cheese

INGREDIENTS

13 oz

butternut squash, sliced into small cubes

1/2

white onion, sliced

1 tbsp

olive oil

8 oz

penne, or pasta of choice

1/2 cup

reserved cooking pasta water

2 tbsp

unsalted butter, melted

1/2 cup

shredded sharp cheddar cheese

1/2 cup

shredded mozzarella

1/2 cup

grated parmesan cheese

additional shredded cheese of choice for topping

kosher salt and ground black pepper,