The BEST Roasted Sweet Potatoes

Ingredients

• 907 g (2 lb)sweet potatoes, peeled and cut into 1.3 cm (½-inch) cubes (about 3 medium sweet potatoes)
• 30 ml (2 tablespoons)olive oil
• 2.5 ml (½ teaspoon)ground cumin
• 2.5 ml (½ teaspoon)paprika
• 2.5 ml (½ teaspoon)garlic powder
• 2.5 ml (½ teaspoon)onion powder
• 3.75 ml (¾ teaspoon)salt
• 1.25 ml (¼ teaspoon)black pepper

Instructions

1. 1

   Heat the oven

   Preheat the oven to 220°C (425°F).

2. 2

   Season the potatoes

   Arrange the sweet potatoes on a large baking sheet. Drizzle with olive oil, add the spices, then toss until the cubes are coated.

3. 3

   Spread in one layer

   Arrange the potatoes in an even, single layer on the baking sheet.

4. 4

   Roast until crisp

   Bake for about 30 minutes, tossing every 10 minutes, until the potatoes are crispy.

What are roasted sweet potatoes?

Roasted sweet potatoes are a familiar American-style side: cubes of the naturally sweet root vegetable cooked in a hot oven until tender inside and browned at the edges. This version uses a straightforward mix of pantry spices to add savoury warmth without masking the potato's sweetness.

The method is simple, but cutting the potatoes evenly and giving them space on the tray helps them roast rather than steam.

Nutrition and macros by portion

The nutrition label shows one serving as written: 174 calories, 2g protein, 31g carbs, 5g fat.

Most of the carbohydrates come from the sweet potatoes, while the olive oil provides nearly all of the fat; the potatoes contribute a small amount of protein. Pair a serving with a protein-rich main and another vegetable for a more balanced plate.

Why these seasonings work

Warm spices: cumin and paprika bring earthy, gently smoky notes, while garlic and onion powder add a savoury base.

Balanced seasoning: salt and black pepper sharpen the flavour and help the sweetness of the potatoes stand out. Toss everything thoroughly so the oil and spices coat the cubes evenly.

Cut for even cooking

Even cubes: aim for pieces around 1.3 cm (½ inch) across. Similar-sized pieces are more likely to cook at the same rate, so you can avoid a tray with some soft cubes and some firm ones.

Dry surfaces: if the peeled potatoes are wet, pat them dry before adding oil and spices; excess moisture can make it harder for the edges to brown.

Give the tray room

Single layer: spread the cubes out so they are not piled on top of one another. If they are crowded, moisture collects around them and the potatoes may soften instead of crisping.

Large tray: use a baking sheet big enough to hold the full batch in one layer. Keep the oven hot at 220°C (425°F) throughout roasting.

Toss as they roast

Regular turning: toss the potatoes every 10 minutes during the roughly 30-minute bake. This exposes different sides to the hot tray and helps them brown more evenly.

Doneness cue: look for crisp, browned edges and tender centres. The recipe gives an approximate time, so check their texture as they finish.

What to serve alongside

A flexible side: serve these potatoes with roasted chicken, fish, beans or a veggie main. Their mildly spiced flavour also works well with a fresh green salad.

For a fuller plate, add a protein-rich main and another vegetable; the potatoes bring the starchy, sweet element.

Recipe notes & tips

• Cut the cubes to a similar size so they roast at a similar pace.
• Use a large baking sheet and leave space between the pieces.
• Toss thoroughly so the oil and spices reach all sides of the cubes.
• Turn the potatoes every 10 minutes for more even browning.
• Check the centres for tenderness as the edges become crisp.

Variations

• Add chilli: include a pinch of chilli powder with the other spices for a little heat.
• Use smoked paprika: swap it for the paprika to give the seasoning a smokier flavour.
• Add fresh herbs: scatter chopped parsley over the potatoes just before serving.
• Try a citrus finish: squeeze a little lemon over the roasted potatoes at the table.
• Change the spice mix: use ground coriander in place of the cumin for a different warm, earthy note.

Common mistakes to avoid

• Uneven cubes: pieces cook at different rates, so cut them to a similar size.
• Crowded tray: the potatoes can steam rather than brown; spread them in one layer with space.
• Skipping the tosses: some sides may brown more than others, so turn the potatoes every 10 minutes.
• Too much moisture: wet cubes are less likely to crisp; pat them dry before seasoning.
• Judging by time alone: ovens and cube sizes vary, so check that the centres are tender and the edges crisp.

How to store

Cool leftovers, then store them in an airtight container in the fridge for up to 3 days. Reheat in an oven or air fryer until hot to help bring back some crispness.

Frequently asked questions