Name: Oven Roasted Sweet Potato and Onion with Fresh Rosemary Recipe
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Cuisine: American
Ingredients: 4 medium-sized sweet potatoes, peeled and cut into bite-sized pieces; 1 large sweet onion, chopped into similarly sized pieces as potatoes; 2-3 tablespoons olive oil (or other neutral oil); 1 heaping tablespoon chopped fresh rosemary; Kosher salt, to taste; Freshly ground black pepper, to taste

Jump to Recipe·Print Recipe· 3.9 from 52 reviews

If you’re looking to add a burst of warmth and earthy charm to your meal, this Oven Roasted Sweet Potato and Onion with Fresh Rosemary Recipe is exactly what you need. It’s a straightforward dish full of vibrant colors, cozy aromas, and flavor layers that sing with each bite. The natural sweetness of tender roasted sweet potatoes perfectly complements the savory onions, while the fresh rosemary lends a fragrant, herbal note that elevates the entire dish. Whether it’s a weeknight side or a special occasion addition, this recipe is comforting, delicious, and effortlessly impressive.

Ingredients You’ll Need

With just a handful of simple ingredients, this recipe comes together quickly but delivers big on flavor. Each component plays a crucial role in building flavorful, golden roasted vegetables that look as good as they taste.

Sweet potatoes: Peeled and cut into bite-sized cubes, they roast to caramelized perfection, offering a naturally sweet base.
Sweet onion: Chopped similarly in size to the potatoes, it adds a mellow, savory crunch once roasted.
Olive oil: A few tablespoons generously coat the veggies, ensuring they crisp up evenly and don’t stick.
Fresh rosemary: Chopped finely, it brings fresh, pine-like herbal notes that make this dish uniquely aromatic.
Kosher salt: Helps to season the vegetables deeply, boosting their natural flavors without overpowering them.
Freshly ground black pepper: Adds a subtle, spicy kick that rounds out the sweet and savory balance.

How to Make Oven Roasted Sweet Potato and Onion with Fresh Rosemary Recipe

Step 1: Preheat Your Oven and Prep Baking Sheets

Start by setting your oven to 400°F. Placing two baking sheets in the oven ahead of time ensures they’re hot and ready, which helps the potatoes and onions develop a beautifully crisp exterior faster when they hit the pan.

Step 2: Toss the Sweet Potatoes and Onions

In a large bowl, combine your cubed sweet potatoes and chopped onions. Drizzle with olive oil and toss until they’re evenly coated. Sprinkle in the fresh rosemary along with a good pinch of kosher salt and freshly ground black pepper, then stir everything together so the herbs and seasonings distribute evenly across every piece.

Step 3: Roast on Preheated Baking Sheets

Divide the potato and onion mixture onto the hot baking sheets. Roast for 25 to 30 minutes until soft on the inside and crispy on the edges. Halfway through roasting, flip and rotate the veggies to ensure they cook evenly and develop that coveted golden-brown color. Keep a close eye if you’ve cut your pieces smaller or larger, as this will affect cooking time.

Step 4: Final Seasoning and Serving Preparation

Once roasted, remove from the oven and give the vegetables a final taste test. Add extra salt or pepper if needed for the perfect savory balance. These roasted sweet potatoes and onions are now ready to bring delightful flavor and texture to your plate.

How to Serve Oven Roasted Sweet Potato and Onion with Fresh Rosemary Recipe

Garnishes

Sprinkle some extra fresh rosemary or a few flakes of coarse sea salt on top just before serving to enhance both presentation and flavor. You can also add a drizzle of honey or a splash of balsamic vinegar for a surprising touch of sweetness and tang.

Side Dishes

This dish pairs wonderfully with a variety of mains. Think herb-roasted chicken, grilled steak, or even a hearty lentil stew. Its warm sweetness and savory bite also complement fresh green salads or steamed vegetables beautifully.

Creative Ways to Present

Serve the roasted sweet potatoes and onions in a rustic wooden bowl for an inviting, homey feel, or plate them alongside a sprinkle of toasted nuts or crumbled feta cheese for some texture contrast. You can even incorporate them into grain bowls or wrap them inside warm flatbreads with a dollop of yogurt for a fun, on-the-go meal.

Make Ahead and Storage

Storing Leftovers

Once cooled, transfer any leftovers to an airtight container and keep them refrigerated for up to 3 days. This recipe holds its flavor well, making it perfect for enjoying throughout the week.

Freezing

If you want to freeze the dish, spread the cooled roasted vegetables flat in a single layer on a baking sheet and freeze until solid, then transfer to a freezer-safe bag or container. They will keep for up to 2 months. Just note that texture might soften slightly after thawing.

Reheating

For the best texture, reheat in a preheated oven at 375°F for about 10-15 minutes or until heated through and crisp again. Microwaving works too, but will soften the edges a bit.

FAQs

Can I use dried rosemary instead of fresh?

Yes, you can use dried rosemary if fresh is unavailable, but use about one-third the amount because dried herbs are more concentrated.

What other herbs work well in this recipe?

Thyme and sage are fantastic alternatives or additions, providing complementary earthy flavors to the roasted veggies.

How do I know when the sweet potatoes are done roasting?

They should be tender when pierced with a fork and have golden-brown edges. The onions will become soft and slightly caramelized.

Can I add other vegetables?

Absolutely. Carrots, parsnips, or bell peppers work wonderfully alongside sweet potatoes and onions in this recipe.

Is this dish suitable for meal prep?

Definitely! Its excellent storage life and easy reheating make it a perfect candidate for meal prep lunches and dinners.

Final Thoughts

This Oven Roasted Sweet Potato and Onion with Fresh Rosemary Recipe is one of those dishes that’s so simple, yet feels truly special every time you make it. It’s cozy and comforting, bursting with natural flavors that come alive with just a few quality ingredients and care. Next time you want a side that’s effortless but unforgettable, you know exactly what to reach for—your oven and a handful of fresh rosemary.