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1. Preheat Oven
- Preheat to 400°F (200°C).
2. Make the Filling
- In a large skillet or saucepan, melt butter over medium heat.
- Sauté onions and garlic until soft.
- Stir in flour and cook 1–2 minutes to form a roux.
- Gradually add chicken broth and milk, stirring until smooth and thickened.
- Season with thyme, salt, and pepper.
- Add cooked chicken and mixed vegetables. Stir everything together.
3. Assemble the Casserole
- Pour the filling into a greased 9×13-inch baking dish.
- Top with biscuit dough pieces or lay puff pastry over the top.
- If using puff pastry, score the top lightly for ventilation.
4. Bake
- Bake for 20–25 minutes or until the topping is golden brown and cooked through.
- Let rest for 5 minutes before serving.
Tips:
- You can use rotisserie chicken to save time.
- Add extra seasoning like garlic powder or paprika for more flavor.
- For a lower-carb version, skip the crust and serve as a creamy chicken and veggie bake.