Baked Sweet Potato Slices

Ingredients

• 4 mediumsweet potatoes
• 4 tbspextra virgin olive oil
• 4garlic cloves
• 6 sprigsfresh thyme
• 30 gParmigiano Reggiano / Parmesan cheese
• to tastesalt and pepper

Instructions

1. 1

   Preheat the oven

   Heat the oven to 180°C (350°F).

2. 2

   Slice the potatoes

   Wash the sweet potatoes and cut them into thin, evenly thick rounds. A mandolin can help, or use a sharp knife.

3. 3

   Season the slices

   Put the sweet potato slices in a large bowl. Add the olive oil and thyme leaves, grate in the garlic and finely grate in the Parmesan. Mix with your hands until the slices are coated with the seasoning.

4. 4

   Arrange the spiral

   Spray an oven dish with oil spray. Working with a handful of slices at a time, overlap them so they lean against one another. Arrange them in a spiral, starting at the outside edge and moving towards the centre.

5. 5

   Bake until browned

   Cover the dish with foil and bake for 30 minutes. Remove it from the oven and raise the temperature to 210°C (410°F). Take off the foil, lightly spray the top of the potatoes with oil spray, then return the dish to the oven for 20 minutes.

6. 6

   Finish and serve

   Grate some fresh Parmesan over the potatoes to serve, and pour over meat-free gravy.

What are baked sweet potato slices?

This is a baked side dish of thinly sliced sweet potatoes, seasoned with garlic, thyme, olive oil and Parmesan. It takes inspiration from the layered potato bakes found in many European home-cooking traditions, with sweet potato bringing its own sweetness and colour.

Even slices and an overlapping spiral help the potatoes cook evenly while making a generous dish easy to serve. The foil-covered first bake tenderises them; uncovering the dish gives the top time to brown.

Nutrition and macros by portion

The nutrition label shows one serving as written: 177 calories, 3g protein, 24g carbs, 8g fat.

Sweet potatoes provide most of the carbohydrates, while olive oil contributes much of the fat; Parmesan adds a little protein and more fat. Pair a serving with a protein-rich vegetarian main, such as beans or lentils, and some green vegetables for a more balanced plate.

Why these ingredients work

Sweet potatoes: Their natural sweetness contrasts with the salty, savoury cheese and garlic. Choose potatoes of a similar size so the rounds are easier to arrange consistently.

Parmesan and thyme: Finely grated cheese clings to the oiled slices, while thyme adds a fragrant herbal note. Freshly grating the cheese helps it distribute through the dish.

Slicing and seasoning

Even rounds: Aim for slices of roughly the same thickness so they soften at a similar rate. A mandolin makes uniform slices, but take care when using one and finish the last piece with a knife.

Good coating: Mix the slices by hand until the oil and seasonings reach both sides. This helps the herbs, garlic and cheese spread through the spiral rather than collecting in one place.

Building the spiral

Overlapping slices: Lean each round against the next, working around the outside of the dish and then towards the centre. Keep the slices close enough to support one another without packing them so tightly that heat cannot circulate.

Dish choice: Use an oven dish large enough to hold the slices in a single arranged layer. The shape of the dish determines how wide the spiral will be.

How to tell when it is ready

Tender centre: After the covered 30-minute bake, the slices should be softening but may not yet be fully browned. The foil traps steam and helps cook the potatoes through.

Golden top: After the final 20 minutes at 210°C, look for browned edges and a tender centre. If the top is colouring quickly, keep an eye on it as it finishes.

Serving the bake

Finishing touch: Add freshly grated Parmesan just before serving for a more pronounced cheesy finish. The recipe also suggests pouring meat-free gravy over the dish.

On the plate: Serve alongside roasted vegetables, a bean dish or another vegetarian main. A crisp green salad can provide a fresh contrast to the soft, rich slices.

Recipe notes & tips

• Try to keep the sweet potato rounds a similar thickness for more even cooking.
• Remove the thyme leaves from their woody stems before adding them to the bowl.
• Grate the garlic finely so it distributes across the slices.
• Arrange the spiral in an oven dish that leaves room for the slices to brown.
• Watch the top during the final 20 minutes, as browning can vary between ovens.

Variations

• Add smoked paprika: Toss a little with the oil and other seasonings for a smoky note.
• Try another herb: Use rosemary in place of thyme for a more robust flavour.
• Make it dairy-free: Leave out the Parmesan and finish with extra herbs.
• Add chilli: Mix chilli flakes into the seasoning for gentle heat.
• Serve with gravy: Pour meat-free gravy over the bake just before serving, as suggested in the method.

Common mistakes to avoid

• Uneven slices: Some rounds may stay firm while others soften; cut them to a consistent thickness.
• Crowded arrangement: Tightly packed slices can cook unevenly; allow some space for heat to move around them.
• Skipping the coating: Dry patches miss out on the seasoning; mix thoroughly so the slices are coated on both sides.
• Leaving the foil on: The top will not brown as intended; remove the foil for the final 20 minutes.
• Overlooking the final bake: The top can brown more quickly in some ovens; check the dish as it approaches the end of cooking.

How to store

Cool leftovers, cover or transfer them to an airtight container, and refrigerate for up to 3 days. Reheat in an oven until hot throughout; the top may be less crisp after storage.

Frequently asked questions