Creamy Butternut Squash Casserole Autumns Comfort Food

Ingredients

• 1 large butternut squash (about 2 lbs / 900g), peeled, seeded, and cubed
• 2 tablespoons olive oil (30ml)
• 1 teaspoon kosher salt (5g)
• ½ teaspoon black pepper (2g)
• 1 tablespoon fresh sage, chopped (optional)
• 4 tablespoons unsalted butter (56g)
• 1 medium yellow onion, finely chopped (about 1 cup)
• 2 cloves garlic, minced
• 3 tablespoons all-purpose flour (24g)
• 3 cups vegetable broth (720ml)
• 1 cup heavy cream (240ml)
• ½ teaspoon nutmeg (1g)
• ½ teaspoon salt (2.5g)
• ¼ teaspoon black pepper (1g)
• ¼ cup grated Parmesan cheese (25g)
• ½ cup all-purpose flour (60g)
• ¼ cup packed light brown sugar (50g)
• ¼ teaspoon salt (1g)
• 4 tablespoons unsalted butter, cold and cubed (56g)
• ½ cup grated Gruyère cheese (50g)