Savory Sweet Potato Casserole
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This Savory Sweet Potato Casserole is creamy, cheesy, and topped with golden Parmesan breadcrumbs for a deliciously savory take on a holiday classic. Roasted sweet potatoes are mashed with fresh rosemary, thyme, sage, butter, cream, eggs, and Parmesan, then finished with an herb-infused breadcrumb topping.
Pair with my Thanksgiving Turkey, Homemade Gravy, Ciabatta Stuffing, and Crispy Brussels Sprouts.
Quick Look: Savory Sweet Potato Casserole
- Prep Time: 10 minutes
- Cook Time: 1 hour and 30 minutes
- Total Time: 1 hour and 40 minutes
- Servings: 12
- Dietary Info: Vegetarian, can be made gluten-free with GF breadcrumbs
- Method: Oven baked
- Technique: Roast the sweet potatoes, make the herb butter, then combine the mashed potatoes with the cream mixture and Parmesan before topping with breadcrumbs and baking.
- Flavor & Texture: Creamy, cheesy, savory, and herbaceous with a crisp breadcrumb topping.
A Savory Take on a Holiday Favorite
This savory sweet potato casserole recipe is my answer to the overly sweet, marshmallow-topped versions that often land on Thanksgiving tables. Instead of sugar, I lean into fresh rosemary, thyme, sage, and plenty of Parmesan cheese—the same flavors my Italian family uses in our rustic holiday dishes. The result is creamy, herbaceous sweet potatoes with a golden, cheesy breadcrumb topping that feels and tastes comforting.
For me, Thanksgiving is about celebrating with food that brings people together around the table. Every bite reminds me that the best holiday recipes are the ones made with simple ingredients, a little creativity, and a lot of love.
You’ll love my Hasselback Sweet Potatoes and Candied Sweet Potatoes.
Made With Amore,
Table of Contents
Simple Ingredients
This savory sweet potato casserole uses a handful of flavorful ingredients to create a creamy filling and cheesy topping.
- Sweet Potatoes: The base of the casserole, roasted until very tender before the flesh is mashed into a creamy filling.
- Fresh Herbs: Rosemary, thyme, and sage infuse the butter with flavor and give the casserole its savory character.
- Butter & Crusty Bread: Butter carries the fresh herb flavor and coats the torn bread to create the golden topping.
- Onion, Cream & Eggs: Softened onion adds savory depth, while heavy cream and eggs give the sweet potato mixture richness and help it set as it bakes.
- Parmesan & Seasonings: The Parmigiano Reggiano adds nutty, savory flavor, while salt, black pepper, and optional lemon zest round everything out.
See recipe card for full information on ingredients and quantities.
Variations & Substitutions
- Gluten-Free: Swap the crusty bread for gluten-free bread or panko.
- Cheese Swaps: Try Gruyère for melty richness, Pecorino Romano for extra saltiness, or even Fontina for a creamier finish. Try my Cauliflower Casserole and Twice Bake Potato Casserole!
- Make It Lighter: Use whole milk instead of of heavy cream for a slightly less rich version.
How to Make Savory Sweet Potato Casserole
The key to this casserole is building flavor in layers. Follow the step-by-step photos and see the recipe card at the bottom for a printable version.
- Preheat the oven to 350°F and arrange racks in upper and lower thirds. Prick potato skins with a fork, place cut-side down on two foil-lined baking sheets, and roast until very tender (70–90 minutes), rotating pans halfway through. Let cool slightly, then increase oven temperature to 400°F.
- In a small saucepan, melt 6 tablespoons of the salted butter over medium heat. Add rosemary, thyme, and sage. Cook, stirring often, until the butter foams and browns slightly and the herbs are crisp, about 5 minutes. Remove from heat and let cool briefly.
- Add the torn bread to the pan with the remaining herb butter. Toss well to coat.
- Stir in ½ cup Parmesan cheese and lemon zest (if using). Season with additional salt and pepper if needed. Transfer to a bowl and set aside.
- In the same pan, melt the remaining 2 tablespoons of salted butter. Add the chopped onion and cook until soft and golden, about 5-7 minutes. Remove from heat and stir in the heavy cream (do not cook).
- Scoop the flesh out of the roasted sweet potatoes into a large bowl (discard skins). Add about half of the herb butter mixture to the potatoes and mash until mostly smooth. Use a potato masher or a fork. Season lightly with salt and pepper.
- Add the cream mixture, eggs, and remaining 1 cup Parmesan to the sweet potatoes.
- Blend or stir until light, creamy, and well combined. Taste and adjust seasoning.
- Spread the potato mixture evenly into a greased 2-quart baking dish. Use the back of a spoon to create rustic peaks and valleys on top. Sprinkle with the breadcrumb mixture.
- Bake at 400°F for 20–25 minutes, until the topping is golden and crisp. Let the casserole rest 10 minutes before serving. Garnish with extra lemon zest if desired.
Savory Sweet Potato Casserole FAQs
This casserole skips the traditional sugary topping and uses fresh rosemary, thyme, sage, butter, Parmesan, salt, and black pepper to balance the natural sweetness of the sweet potatoes. The Parmesan breadcrumb topping adds another savory element.
Roasting concentrates the natural sweetness and prevents the potatoes from becoming watery, giving your casserole a richer flavor and creamier texture.
Make Ahead: Assemble up to 1 day ahead (without topping), refrigerate, then bake with breadcrumbs just before serving. Leftovers keep well for 3 days in the fridge.
Freezing: This casserole freezes beautifully without the breadcrumb topping. Thaw overnight, add breadcrumbs, and bake until golden and heated through.
Serving Suggestions
This savory sweet potato casserole is made for a holiday table. Serve it alongside a main such as Oven Baked Chicken Breast, Prime Rib Roast, or Fresh Roasted Ham. Add sides like Green Beans and Potatoes, Vegetable Au Gratin, or Brussels Sprouts with Bacon and Balsamic for an herb-filled holiday spread.
My Pro Tips
Recipe Tips
- Roast until very tender. The sweet potatoes should be soft enough to scoop easily from the skins and mash until mostly smooth.
- Watch the herb butter closely. Cook the butter with the rosemary, thyme, and sage until it foams and browns slightly, taking care not to burn it.
- Don’t overmix the potatoes. Blend or stir the filling until light, creamy, and well combined rather than mixing it excessively.
- Keep the topping crisp. Add the breadcrumb mixture immediately before baking so it can brown and crisp in the oven.
- Plan ahead for the holidays. Assemble the casserole without the breadcrumbs up to 1 day ahead, then add the topping just before baking.
More Casserole Side Dishes
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Savory Sweet Potato Casserole
Ingredients
- 5 pounds medium sweet potatoes, halved lengthwise
- ¼ cup fresh rosemary leaves, chopped
- ¼ cup fresh thyme leaves, chopped
- ¼ cup fresh sage leaves, chopped
- 1 stick butter, divided
- 2 ½ cups day-old crusty bread, torn into small pieces (or rustic homemade breadcrumbs)
- 1 small onion, finely chopped
- 2 cups heavy cream, or whole milk
- 2 large eggs, lightly beaten
- 1 ½ cups Parmigiano Reggiano, or Parmesan, finely grated, divided
- Kosher salt and freshly ground black pepper, to taste
- Zest of 1 lemon, optional (for mixing into breadcrumbs or garnish)
Instructions
- Roast the Sweet Potatoes: Preheat oven to 350°F and arrange racks in upper and lower thirds. Prick potato skins with a fork, place cut-side down on two foil-lined baking sheets, and roast until very tender (70–90 minutes), rotating pans halfway through. Roasting and not boiling is what gives this recipe extra flavor! Let cool slightly, then increase oven temperature to 400°F.
- Make the Herb Butter: n a small saucepan, melt 6 tablespoons of the salted butter over medium heat. Add rosemary, thyme, and sage. Cook, stirring often, until the butter browns slightly and the herbs are crisp, about 5 minutes. Remove from heat and let cool briefly.
- Mash the Potatoes: Scoop the flesh out of the roasted sweet potatoes into a large bowl (discard skins). Add about half of the herb butter mixture to the potatoes and mash until mostly smooth. Season lightly with salt and pepper.
- Make the Breadcrumb Topping: Add the torn bread to the pan with the remaining herb butter. Toss well to coat. Stir in ½ cup Parmesan cheese and lemon zest (if using). Season with additional salt and pepper if needed. Transfer to a bowl and set aside.
- Prepare the Cream Mixture: In the same pan, melt the remaining 2 tablespoons of salted butter. Add the chopped onion and cook until soft and golden, about 5-7 minutes. Remove from heat and stir in the heavy cream (do not cook). Add the cream mixture, eggs, and remaining 1 cup Parmesan to the sweet potatoes. Blend or stir until light, creamy, and well combined. Taste and adjust seasoning.
- Assemble and Bake: Spread the potato mixture evenly into a greased 2-quart baking dish. Use the back of a spoon to create rustic peaks and valleys on top. Sprinkle with the breadcrumb mixture. Bake at 400°F for 20–25 minutes, until the topping is golden and crisp.
- Serve: Let the casserole rest 10 minutes before serving. Garnish with extra lemon zest if desired.
- Make Ahead: Assemble (without breadcrumbs) up to 1 day in advance, cover, and refrigerate. Add breadcrumbs just before baking.
Notes
- Pair with my Thanksgiving Turkey, Homemade Gravy, Ciabatta Stuffing, and Crispy Brussels Sprouts.
- Roast until very tender. The sweet potatoes should be soft enough to scoop easily from the skins and mash until mostly smooth.
- Watch the herb butter closely. Cook the butter with the rosemary, thyme, and sage until it foams and browns slightly, taking care not to burn it.
- Don’t overmix the potatoes. Blend or stir the filling until light, creamy, and well combined rather than mixing it excessively.
- Keep the topping crisp. Add the breadcrumb mixture immediately before baking so it can brown and crisp in the oven.
- Plan ahead for the holidays. Assemble the casserole without the breadcrumbs up to 1 day ahead, then add the topping just before baking.
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
The most incredible sweet potato casserole. I crave this one on repeat! Everyone loves it as a holiday side dish.