This Herb-Roasted Sweet Potato, Beet & Potato Tian is a stunning layered vegetable casserole featuring thinly sliced sweet potatoes, golden potatoes, and earthy beets arranged in a beautiful spiral. Infused with garlic, fresh herbs, olive oil, and finished with Parmesan cheese, this elegant side dish is as delicious as it is eye-catching—perfect for holidays, family dinners, or any special occasion.

Recipe Overview

Ingredients

Vegetables

• 2 medium sweet potatoes, peeled
• 2 medium Yukon Gold potatoes
• 2 medium red beets, peeled
• 1 small yellow onion, very thinly sliced (optional)

Herb Garlic Oil

• ¼ cup extra virgin olive oil
• 3 cloves garlic, minced
• 1 tablespoon fresh thyme leaves
• 1 tablespoon chopped fresh rosemary
• 1 tablespoon chopped fresh parsley
• 1 teaspoon Italian seasoning
• 1 teaspoon sea salt
• ½ teaspoon black pepper
• ½ teaspoon smoked paprika

Topping

• ½ cup grated Parmesan cheese
• 2 tablespoons breadcrumbs (optional, for extra crispiness)
• 1 tablespoon melted butter

Garnish

• Fresh thyme sprigs
• Chopped parsley
• Extra Parmesan cheese

Equipment Needed

• 9-inch round baking dish or cast-iron skillet
• Mandoline slicer or sharp knife
• Small mixing bowl
• Pastry brush
• Aluminum foil

Instructions

Step 1: Prepare the Vegetables

Preheat the oven to 375°F (190°C).

Peel the sweet potatoes and beets.

Wash the Yukon Gold potatoes.

Using a mandoline or sharp knife, slice all vegetables into ⅛-inch (3 mm) thick rounds.

Keep the beet slices separate to prevent them from staining the other vegetables.

Step 2: Prepare the Herb Oil

In a small bowl, whisk together:

• Olive oil
• Garlic
• Thyme
• Rosemary
• Parsley
• Italian seasoning
• Salt
• Black pepper
• Smoked paprika

Step 3: Assemble the Tian

Lightly grease the baking dish.

Arrange the vegetable slices upright in an overlapping pattern, alternating:

• Sweet potato
• Yukon Gold potato
• Beet
• Onion (if using)

Continue until the dish is completely filled.

Brush the herb oil generously between and over the vegetable slices.

Step 4: First Bake

Cover the dish tightly with aluminum foil.

Bake for 45 minutes until the vegetables begin to soften.

Step 5: Add the Topping

Remove the foil.

Sprinkle evenly with:

• Parmesan cheese
• Breadcrumbs (if using)

Drizzle with melted butter.

Step 6: Finish Baking

Return the dish to the oven, uncovered.

Bake for an additional 25–30 minutes, or until:

• The vegetables are tender.
• The edges are golden and crispy.
• The cheese is melted and lightly browned.

For extra color, broil for 2–3 minutes at the end.

Step 7: Rest and Serve

Allow the tian to rest for 10 minutes before serving.

Garnish with:

• Fresh parsley
• Thyme sprigs
• Extra Parmesan cheese

Serve warm.

Tips for the Best Tian

Slice Evenly

Use a mandoline for uniform slices to ensure even cooking.

Keep Beet Slices Separate

Arrange them last or handle separately to minimize color bleeding.

Season Every Layer

Brushing herb oil throughout the layers ensures every bite is flavorful.

Cover First, Crisp Later

Baking covered softens the vegetables, while uncovering at the end creates crispy, caramelized edges.

Flavor Variations

Goat Cheese Tian

Replace Parmesan with crumbled goat cheese after baking.

Gruyère & Herb

Use shredded Gruyère cheese for a rich, nutty flavor.

Mediterranean Version

Add:

• Thinly sliced zucchini
• Roma tomatoes
• Crumbled feta cheese
• Fresh oregano

Garlic Butter Tian

Replace olive oil with melted garlic butter for a richer taste.

Vegan Option

Skip the cheese and breadcrumbs, then sprinkle with toasted walnuts or pecans after baking.

What to Serve With

Main Dishes

• Herb-roasted chicken
• Grilled salmon
• Roast turkey
• Beef tenderloin
• Pork loin

Vegetarian Pairings

• Lentil loaf
• Stuffed mushrooms
• Quinoa salad
• Roasted chickpeas

Bread

• Crusty French bread
• Garlic bread
• Dinner rolls

Storage Instructions

Refrigerator

Store leftovers in an airtight container for up to 4 days.

Freezer

Freeze cooled portions in freezer-safe containers for up to 2 months.

Thaw overnight in the refrigerator before reheating.

Reheating

Oven

Bake at 350°F (175°C) for 15–20 minutes until heated through.

Air Fryer

Reheat at 350°F (175°C) for 5–7 minutes.

Microwave

Heat individual servings for 2–3 minutes.

Nutrition Information (Per Serving)

Frequently Asked Questions

Can I prepare this ahead of time?

Yes! Assemble the tian up to 24 hours ahead, cover, and refrigerate. Bake when ready to serve.

Do I have to peel the potatoes?

No. Yukon Gold potatoes have thin skins that become tender during baking. Peeling is optional.

Can I use red potatoes?

Absolutely! Red potatoes, Russets, or fingerling potatoes all work well.

Why are my vegetables still firm?

The slices may have been too thick. Aim for ⅛-inch (3 mm) slices and bake covered long enough to soften them before uncovering.

Can I make this dairy-free?

Yes. Omit the Parmesan and butter or replace them with dairy-free alternatives.

Recipe Notes

✅ Naturally gluten-free (without breadcrumbs)

✅ Vegetarian

✅ Rich in fiber and vitamins

✅ Perfect for holidays and entertaining

✅ Beautiful presentation with simple ingredients

Make-Ahead Tip

Slice the vegetables and prepare the herb oil up to one day in advance. Store them separately in the refrigerator, then assemble and bake fresh for the best texture.

Serving Suggestion

Serve alongside roasted chicken, grilled steak, baked salmon, or a fresh green salad. This colorful tian also makes an elegant centerpiece for Thanksgiving, Christmas, Easter, or Sunday family dinners.

Chef’s Secret

After arranging the vegetables, gently tap the baking dish on the counter to help the slices settle evenly. Brush the herb oil generously between the layers rather than only on top—this seasons the vegetables all the way through. For an irresistible golden finish, sprinkle freshly grated Parmesan during the final 20 minutes of baking and broil for the last 2 minutes until lightly crisp and bubbling. Finish with flaky sea salt and fresh thyme just before serving for a restaurant-quality presentation.