Best Spices for Sweet Potatoes

Mashed on the dinner plate or baked into pie? With sweet potatoes, that’s the first question. For a sweet dish, cinnamon is nearly all you need: in the two simplest public-health recipes below, it’s the only spice besides black pepper. For a savory side, rosemary, black pepper and a little cayenne or chili powder take over, with heat playing against the sweetness. There’s also one safety point worth knowing about the most popular spice.

At a glance

Seasoning	Job	In the recipes below
Cinnamon	Warm, sweet aroma	Two of three¹²
Brown sugar	Extra sweetness, light caramel note	One¹
Olive oil	Roasting fat	Two of three²³
Black pepper	Mild heat	Two of three²³
Rosemary	Piney, savory herb	One (dried)³
Cayenne and chili powder	Heat against the sweetness	One³
Pumpkin pie spice	Cinnamon, ginger, nutmeg and allspice in one jar	Suggested by its maker⁴
Salt	Seasoning	Two of three²³

Three recipes side by side

	USDA Sweet Potato Casserole¹	Durham County Roasted Sweet Potatoes²	Taste of Home Roasted Rosemary Sweet Potatoes³
Sweet potatoes	2 3/4 cups canned, drained	2, in 1-inch cubes (serves 4)	2 large, in 3/4-inch rounds (serves 4)
Fat	None	2 tbsp olive oil	1 tbsp olive oil
Spice	1 tsp ground cinnamon	1/2 tsp ground cinnamon	1 tsp dried rosemary, 1/2 tsp chili powder, 1/8 tsp cayenne
Sweetener	1 1/2 tsp brown sugar	None	None
Salt and pepper	None	1/4 tsp salt, 1/2 tsp pepper	1/2 tsp salt, 1/2 tsp pepper
Other	Milk and quick oats as a topping
Cooking	350°F, 20 minutes	375°F, 25 to 30 minutes	425°F, 20 minutes covered, then 10 to 12 uncovered

These are the publishers’ recipes, not a house standard. The pattern’s easy to see: one sweet spice for a sweet dish, or a savory herb plus heat for a roasted side.

The sweet side

Cinnamon: the default

Both government recipes use cinnamon as their only warm spice, a teaspoon in the USDA casserole and half a teaspoon in Durham County’s roasted version.¹²

Most cinnamon sold in North America is cassia, not Ceylon cinnamon, according to NCCIH.⁵ That only matters if you eat a lot of it every day. Germany’s BfR says a 60 kg adult reaches the tolerable daily intake for coumarin at about 2 g of average cassia a day.⁶ The recipes above use 1/2 to 1 teaspoon for a whole dish of four or more servings. NCCIH sums up that research doesn’t clearly support cinnamon for any health condition,⁵ so there’s no reason to add more than tastes right. See Ceylon vs. cassia cinnamon and too much cinnamon.

Pie-spice blends: cinnamon plus

McCormick suggests its pumpkin pie spice on roasted sweet potatoes, carrots or acorn squash, and the blend’s label lists cinnamon, ginger, nutmeg and allspice.⁴ It suggests its apple pie spice for sweet potatoes too.⁷ A blend is the easy way to bring in the other warm spices. Ginger adds pungency, and nutmeg a warm, slightly sweet taste. See pumpkin pie spice, ginger, nutmeg and allspice.

Brown sugar and honey

The USDA casserole adds 1 1/2 teaspoons of brown sugar to its cinnamon and oat topping.¹ Honey and maple syrup are familiar alternatives in glazed and candied sweet potatoes, though none of the three recipes here uses them.

The savory side

Rosemary

Taste of Home’s recipe tosses the potatoes with a teaspoon of crushed dried rosemary before roasting.³ Rosemary is pungent and slightly bitter, with a warm, piny scent, and vegetables are among the foods it commonly seasons. See dried vs. fresh rosemary and cooking with rosemary.

You could also infuse rosemary into butter or oil for a topping, though none of these recipes does.

Cayenne and chili powder

The same recipe uses 1/8 teaspoon of cayenne and 1/2 teaspoon of chili powder for two large potatoes,³ a small amount for a strong spice. Ground red pepper is sometimes called cayenne pepper. Heat against sweetness is the appeal, and how much is up to you. See cayenne pepper uses, and chipotle powder for a smoky alternative.

Black pepper and salt

Both roasted recipes use half a teaspoon of pepper with their salt.²³ Grind it fresh if you like; these recipes don’t specify. See cracked vs. ground black pepper.

Olive oil

The two roasted recipes use olive oil, 1 to 2 tablespoons for four servings.²³ Melted butter or another oil works if you prefer.

Sweet potato or yam?

Sweet potatoes are unrelated to true yams. US growers use “yam” for soft, orange-fleshed sweet potatoes. Every spice here works the same whichever name is on the bin.

“Sweet Potato Casserole”, USDA Food Distribution Program on Indian Reservations, via MyPlate. myplate.gov · Regulator ↩ ↩² ↩³ ↩⁴ ↩⁵
“Roasted Sweet Potatoes”, Durham County Public Health (SNAP-funded). dconc.gov · Regulator ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸
Kristin Stone, “Roasted Rosemary Sweet Potatoes”, Taste of Home, 2023. tasteofhome.com · Publication ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰
“McCormick Pumpkin Pie Spice”, McCormick & Company. mccormick.com · Merchant ↩ ↩²
“Cinnamon: Usefulness and Safety”, NCCIH, 2024. nccih.nih.gov · Regulator ↩ ↩²
“Cassia cinnamon with high coumarin contents to be consumed in moderation”, BfR. bfr.bund.de · Regulator ↩
“McCormick Apple Pie Spice”, McCormick & Company. mccormick.com · Merchant ↩

Also drawn on

Sweet potato (Britannica Editors, revised by Melissa Petruzzello, updated 5 Sep 2026), Encyclopaedia Britannica. britannica.com
Rosemary (revised by Anoushka Pant, updated 4 Sep 2026), Encyclopaedia Britannica. britannica.com
Red Pepper, McCormick Science Institute. mccormickscienceinstitute.com
Zingiber officinale (PROSEA), H. Sutarno, E.A. Hadad and M. Brink, Plant Resources of South-East Asia, via Pl@ntUse. uses.plantnet-project.org
Nutmeg (Britannica Editors, updated 17 Aug 2026), Encyclopaedia Britannica. britannica.com

Sweet Potato Spices: Cinnamon for the Sweet Side, Rosemary and Cayenne for the Savory