Preheat the oven to 400°F (200°C).

Cut the butternut squash into cubes and place on a baking sheet.

Roast the squash in the oven for about 30-35 minutes until tender.

Meanwhile, roast the garlic by wrapping it in foil and placing it in the oven for the last 20 minutes of roasting.

Once the squash and garlic are done, combine them in a pot.

Add butter and milk, then mash until smooth.

Season with salt and pepper to taste.