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Root veggie gratin with golden melted cheese and thyme in a white baking dish.

Root Veggie Gratin

Creamy Root Veggie Gratin layered with sweet potatoes, parsnips, and turnips in a garlic-herb cream sauce, baked with melted Gruyère and Parmesan until golden and bubbling.
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Prep Time 25 minutes
Cook Time 1 hour 15 minutes
Resting Time 10 minutes
Total Time 1 hour 50 minutes
Servings: 8 servings
Course: Dinner, Holiday Sides, Side Dish
Cuisine: American, French-inspired
Calories: 340
Ingredients Equipment Method Notes

Ingredients
  

Vegetables
  • 2 medium Sweet potatoes Peeled and thinly sliced
  • 2 large Parsnips Peeled and thinly sliced
  • 1 large Turnip Peeled and thinly sliced
  • 2 medium Yukon Gold potatoes Thinly sliced
  • 1 small Rutabaga Peeled and thinly sliced (optional)
Cream Sauce
  • 2 cups Heavy cream
  • 1 cup Whole milk
  • 4 cloves Garlic Minced
  • 2 tablespoon Fresh thyme leaves
  • 1 teaspoon Salt
  • ½ teaspoon Black pepper
  • ¼ teaspoon Nutmeg
Cheese & Topping
  • 1.5 cups Gruyère or Swiss cheese Shredded
  • 0.5 cup Parmesan cheese Grated
  • 2 tablespoon Butter Cut into small pieces
  • Fresh thyme sprigs For garnish

Equipment

  • Mandoline slicer For uniform thin slices
  • 9x13-inch baking dish For layering vegetables
  • Medium saucepan For cream sauce
  • Whisk For stirring sauce smoothly
  • Sharp knife For peeling and trimming vegetables
  • Cutting board For prepping roots
  • Aluminum foil To cover dish during baking
  • Oven Preheated to 375°F

Method
 

  1. Add thyme sprigs and serve warm.
  2. Use mandoline for ⅛-inch slices.
  3. Heat cream, milk, garlic, and thyme; steep 10 mins.
  4. Add salt, pepper, and nutmeg.
  5. Grease baking dish generously.
  6. Alternate colors and types evenly.
  7. Add small amounts between every few layers.
  8. Add remaining sauce, cover tightly with foil.
  9. Bake 45 minutes.
  10. Remove foil, top with cheeses and butter pieces.
  11. Bake 30 minutes more until golden and bubbling.
  12. Cool 10 minutes before serving.
    Root veggie gratin with golden melted cheese and thyme in a white baking dish.
  13. Add thyme sprigs and serve warm.

Notes

Nutrition information is automatically calculated, so should only be used as an approximation.