01 -
Preheat oven to 400°F (200°C). Peel and slice the butternut squash. Toss with olive oil, salt, and pepper.
02 -
Spread squash on a baking sheet and roast for 20-25 minutes, until tender and slightly caramelized.
03 -
Melt butter in a saucepan, whisk in flour, then slowly whisk in heavy cream. Add garlic, salt, and pepper.
04 -
Reduce heat, stir in Gruyere cheese until melted and smooth. Stir in nutmeg.
05 -
Layer roasted squash in a baking dish. Pour Mornay sauce over squash.
06 -
Bake for 20-25 minutes, until bubbly and golden brown. Let rest before serving.