Not a fan of gooey, marshmallow-topped sweet potato casseroles? Me neither. This savory sweet potato casserole with apples and bacon offers a flavorful alternative to the candied version. The recipe layers thinly sliced sweet potatoes with sautéed apples, crisp bacon, and nutty gruyère in an herb-infused custard. It’s straightforward to prepare and can easily be doubled for larger gatherings—perfect for the holidays or any time you want a refined side dish.
This recipe has been updated with refreshed photos and clarified steps since its original 2014 posting.
The recipe breaks down into a few simple components: an herb-infused cream, sautéed apples, thinly sliced sweet potatoes, crisp bacon, grated gruyère, and an egg custard that binds everything together. None of the parts are difficult, but doing each step and then assembling the dish produces the best result.
I prefer to bake bacon on a sheet pan because it’s less messy than frying and frees up the stovetop while I finish other components. Bake until crisp, then chop or crumble for the casserole.
Begin by gently simmering half-and-half with the fresh herbs and garlic so it reduces and picks up flavor. While the cream is warming, sauté the apple slices briefly in butter with a pinch of nutmeg until they’re just tender but still hold their shape.
Peel and slice the sweet potatoes as thinly and evenly as you can. A mandoline or the slicer attachment on a food processor speeds the work, but a sharp knife often yields the most consistent results. The thin slices help the potatoes cook through and meld with the custard.
Grate the gruyère finely for a light, fluffy melt. Gruyère brings a nutty, rich flavor and an excellent melting quality. If gruyère isn’t available, Emmental or Swiss can be used as a substitute, though the flavor will be slightly different.
Tempering Eggs for the Custard
To combine the infused cream with eggs without scrambling them, temper the eggs first. Tempering gently raises the eggs’ temperature so they stay smooth in the custard:
- Pour about 1/3 to 1/2 cup of the hot cream mixture into a glass measuring cup or small bowl.
- Whisk the eggs in a medium bowl until combined.
- While whisking the eggs, slowly stream the hot cream into the eggs to gradually increase their temperature.
- Once the eggs are warmed, whisk in the remaining cream in a steady stream until fully combined.
Layering the Casserole
- Spray a medium casserole dish with vegetable spray.
- Arrange one-third of the sweet potato slices on the bottom of the dish, slightly overlapping (shingling) them.
- Scatter half of the sautéed apples over the potatoes.
- Top with one-third of the grated gruyère and one-third of the crumbled bacon.
- Drizzle one-third of the tempered custard over the layer.
- Repeat with another layer of potatoes, apples, cheese, bacon, and custard.
- Finish with a final layer of potatoes, the remaining custard, and a sprinkle of cheese and bacon on top.
Cover the dish tightly with foil and bake at 400°F for about 40 minutes. Remove the foil and continue to bake another 20–25 minutes, until the top is golden brown, bubbly, and the potatoes are tender through. Let the casserole rest about ten minutes before serving so the custard sets slightly.
The combination of sweet potato and apple gives a balanced sweet-tart profile, while the bacon adds smoky crunch and the gruyère lends a savory, nutty richness. The herb-infused custard brings everything together without overpowering the other ingredients, acting as a silky binder that enhances texture and flavor.
This savory sweet potato casserole is a refined alternative to classic marshmallow-topped versions and pairs well with roasted meats and holiday mains. Serve it alongside roasted turkey or any hearty main for a seasonal, crowd-pleasing side.
Savory Sweet Potato Casserole
INGREDIENTS:
- 2 cups half and half
- 3 tablespoons fresh chopped sage
- 1 tablespoon fresh chopped rosemary
- 2 teaspoons fresh chopped thyme
- 2 cloves garlic minced
- ¼ teaspoon kosher salt
- ¼ teaspoon freshly ground pepper
- 2 teaspoons butter
- 1 large Granny Smith apple peeled and thinly sliced
- ¼ teaspoon ground nutmeg
- 3 large eggs
- 3 medium sweet potatoes
- ⅓ pound bacon (about 5 strips), cooked until crispy
- 1½ cups gruyère cheese
DIRECTIONS:
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Preheat the oven to 400°F (200°C).
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In a medium saucepan, combine the half and half, sage, rosemary, thyme, garlic, salt, and pepper. Heat over medium-low until the mixture comes to a gentle simmer, stirring occasionally. Simmer until reduced by about one-quarter; do not boil.
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In a skillet, melt the butter over medium heat and add the sliced apples. Sprinkle with nutmeg and sauté 3–5 minutes, until the apples are tender but still hold their shape. Set aside.
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Whisk the eggs in a medium bowl. Temper the eggs by whisking in about 1/3 cup of the hot cream mixture in a slow, steady stream. Once incorporated, whisk in the remainder of the cream until smooth.
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Spray a medium casserole dish with vegetable spray. Layer one-third of the sweet potato slices across the bottom, overlapping. Top with half the apples, one-third of the bacon, one-third of the cheese, and one-third of the custard. Repeat the layers, finishing with the remaining custard, cheese, and bacon.
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Cover tightly with foil and bake 40 minutes, or until potatoes are tender when pierced.
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Remove the foil and bake an additional 20–25 minutes until golden brown and bubbly. Let rest 10 minutes before serving.
NOTES:
NUTRITION:
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