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A close-up spoonful of the hearty vegetable casserole, highlighting the creamy cheese sauce coating pieces of carrot, broccoli, and sweet potato.

Winter Vegetable Casserole: The Ultimate Cozy Recipe

This Winter Vegetable Casserole is the ultimate comfort food, featuring a hearty mix of roasted root vegetables in a rich, creamy three-cheese sauce. It's a customizable, easy-to-make dish perfect for a cozy and satisfying weeknight dinner.
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Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Servings: 8 servings
Course: Main Course, Side Dish
Cuisine: American
Calories: 450
Ingredients Equipment Method Notes

Ingredients
  

  • 2 cups carrots peeled and chopped into 1-inch pieces
  • 2 cups parsnips peeled and chopped into 1-inch pieces
  • 2 cups sweet potatoes peeled and chopped into 1-inch pieces
  • 1 large yellow onion chopped
  • 2 cups broccoli florets
  • 2 cups cauliflower florets
  • 2 tbsp olive oil
  • 1 tsp dried thyme
  • 1 tsp salt
  • 1/2 tsp black pepper
  • 4 tbsp unsalted butter
  • 1/4 cup all-purpose flour
  • 3 cups whole milk
  • 1 1/2 cups sharp cheddar cheese shredded
  • 1 cup Gruyère cheese shredded
  • 1 tsp Dijon mustard
  • 1/4 tsp nutmeg
  • 1/2 cup panko breadcrumbs
  • 1/4 cup grated Parmesan cheese

Equipment

  • 1 9x13 inch Baking Dish
  • 1 Large Baking Sheet
  • 1 Saucepan

Instructions
 

  1. Preheat your oven to 400°F (200°C).
  2. On a large baking sheet, combine the chopped carrots, parsnips, sweet potatoes, and onion. Drizzle with olive oil and sprinkle with thyme, salt, and pepper. Toss to coat evenly.
  3. Roast for 20-25 minutes, until the vegetables begin to soften. Add the broccoli and cauliflower florets to the pan, toss gently, and roast for an additional 10-15 minutes until all vegetables are tender-crisp.
  4. While the vegetables roast, prepare the cheese sauce. Melt the butter in a medium saucepan over medium heat. Whisk in the flour and cook for 1 minute, stirring constantly.
  5. Gradually pour in the milk, whisking continuously to ensure the sauce is smooth. Bring to a simmer and cook for 5-7 minutes, until the sauce has thickened.
  6. Remove the saucepan from the heat. Stir in the shredded cheddar, Gruyère, Dijon mustard, and nutmeg. Continue to stir until the cheese is fully melted and the sauce is velvety smooth.
  7. Transfer the roasted vegetables into a 9x13 inch baking dish. Pour the cheese sauce over the vegetables and gently stir to combine.
  8. In a small bowl, mix the panko breadcrumbs and grated Parmesan cheese. Sprinkle this mixture evenly over the casserole.
  9. Bake for 15-20 minutes, or until the sauce is bubbling and the topping is golden brown and crispy.
  10. Let the casserole rest for 5-10 minutes before serving to allow the sauce to set.

Notes

Tip 1: For the creamiest sauce, always shred your own cheese. Pre-shredded varieties contain additives that can result in a grainy texture.
Tip 2: Ensure vegetables are cut into uniform 1-inch pieces for even cooking and perfect texture in every bite.
Tip 3: Don't skip the step of pre-roasting the vegetables. It develops a deep, caramelized flavor that is essential to the dish.
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