Description
Cozy up with this soul-warming casserole that combines tender chicken, sweet butternut squash, and silky leeks under a golden cheesy crust. Perfect for chilly evenings when only comfort food will do!
Ingredients
Scale
- 1.5 lbs (680g) boneless, skinless chicken breasts, cut into 1-inch chunks
- 1 medium butternut squash (about 2 lbs/900g), peeled and cut into 1-inch cubes
- 3 medium leeks (about 1 lb/450g), white and light green parts only, cleaned and sliced into half-moons
- 2 tablespoons olive oil, divided
- 2 tablespoons butter
- 3 garlic cloves, minced
- 2 tablespoons all-purpose flour
- 1¼ cups (300ml) chicken stock
- ¾ cup (180ml) half-and-half or light cream
- 1 tablespoon fresh thyme leaves (or 1 teaspoon dried)
- 1 teaspoon Dijon mustard
- 1 cup (100g) grated Gruyère or cheddar cheese
- ½ cup (50g) Panko breadcrumbs
- Salt and freshly ground black pepper to taste
Instructions
- Preheat oven to 375°F (190°C) and lightly grease a 9×13-inch baking dish. Toss butternut squash with 1 tablespoon olive oil, salt, and pepper. Spread on a baking sheet and roast for 15 minutes until edges begin to caramelize.
- Heat remaining tablespoon of olive oil in a large skillet over medium-high heat. Season chicken with salt and pepper, then cook for 4-5 minutes until just browned but not fully cooked. Transfer to a plate.
- In the same skillet, melt butter over medium heat. Add leeks and cook for 5-6 minutes until softened. Add garlic and cook for 30 seconds until fragrant.
- Sprinkle flour over leeks and stir for 2 minutes. Gradually whisk in chicken stock, then half-and-half, creating a smooth sauce. Simmer for 3-4 minutes until slightly thickened. Stir in thyme and Dijon mustard.
- Return chicken to skillet along with roasted squash and any accumulated juices. Gently fold everything together until evenly coated in sauce. Adjust seasoning with salt and pepper.
- Transfer mixture to prepared baking dish. Top with grated cheese and Panko breadcrumbs. Bake for 25-30 minutes until bubbly and golden brown. Let stand for 5 minutes before serving.