Sweet Potato Fajitas with Zesty Lime Sauce

Easy sweet potato fajitas with roasted peppers, onions, and a zesty lime sauce. Perfect for a colourful, flavour-packed weeknight dinner!

Looking for a vibrant, plant-forward twist on classic fajitas? These sweet potato fajitas are packed with colour, flavour, and a touch of spice, making them perfect for weeknight dinners or casual entertaining. Roasted until tender and lightly caramelised, the sweet potatoes pair beautifully with peppers and onions, while a bright, creamy zesty lime sauce takes every bite to the next level. Serve them with warm tortillas and your favourite toppings for a meal that’s as fun to assemble as it is to eat.

These fajitas are easy to make ahead and perfect for meal prep, keeping well in the fridge for a few days without losing their flavour. They’re also a fantastic way to enjoy a wholesome, veggie-packed dinner that doesn’t skimp on satisfaction.

Tips for Best Results

• Make ahead: The lime sauce can be made up to 2 days in advance. Store roasted vegetables in an airtight container in the fridge for 3-4 days.
• Extra toppings: Try sour cream, grated cheese, diced fresh tomatoes, salsa, or chopped cilantro.
• Vegan option: Use a dairy-free yogurt for the sauce and swap flour tortillas for corn tortillas.
• Spice it up: Add a pinch of smoked paprika, cayenne, or chipotle powder to the fajita seasoning for an extra kick.

Ingredients and Substitutions

• Sweet potatoes – Provide a naturally sweet and hearty base for the fajitas. Butternut squash, pumpkin, or Yukon gold potatoes can be used instead.
• Bell peppers – Add colour, sweetness, and a slight crunch. Any colour peppers or poblano peppers for mild heat work well.
• Onion – Builds a sweet, aromatic layer of flavour. Red onion, shallots, or leeks can be used for a milder taste.
• Garlic – Adds a fragrant, savoury depth. Garlic powder can be used if fresh cloves aren’t available.
• Avocado – Adds creaminess and balances the spices. Guacamole or roasted zucchini can be substituted.
• Lime wedges – Provide brightness and a zesty finish. Lemon works well as an alternative.
• Fajita seasoning – Brings a smoky, spicy kick to the vegetables. Can be replaced with a homemade mix of smoked paprika, chili powder, cumin, onion powder, garlic powder, salt, and pepper.
• Olive oil – Helps roast the vegetables evenly. Avocado oil or sunflower oil can be used instead.
• Tortillas – Wrap the filling and complete the fajitas. Flour, corn, whole wheat, or lettuce wraps work as alternatives.
• Greek yogurt – Forms the creamy base of the zesty lime sauce. Dairy-free yogurt, sour cream, or crème fraîche can be used.
• Lime zest and juice – Give the sauce a bright, tangy flavour. Lemon or a splash of orange juice can be substituted.

Looking for More Sweet Potato Recipes?

Check out more of my favourite ways to cook with sweet potatoes!

This Ground Turkey Sweet Potato Skillet is a healthy, flavourful gluten-free meal that can be made in one pot for your whole family to enjoy! 

Enjoy all the flavours of chili in this vegan black bean chili. This is a hearty dish that is very filling and nutritious.

This tasty Cajun sweet potato soup recipe is a bowl of comforting goodness! It’s the perfect mix of sweet and spicy that will hit the spot.

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Sweet Potato Fajitas with Zesty Lime Sauce

Yields: 6-8 servings | Prep time: 20 minutes | Cook time: 25-30 minutes

Ingredients

For the Fajitas

• 2 medium sweet potatoes, peeled and sliced into ½-inch wedges
• 2 bell peppers (mixed colours), seeds removed and sliced
• 1 onion, sliced
• 2 garlic cloves, crushed and separated
• 1 avocado, sliced
• 1 lime, cut into wedges for serving
• 2 tablespoons fajita seasoning, divided
• 2 tablespoons olive oil, divided
• 6-8 small flour tortillas, warmed

For the Zesty Lime Sauce

• 1 cup plain Greek yogurt
• Zest and juice of 1 lime (about 1 tablespoon juice)

Directions

1. Preheat the oven to 400°F (200°C).

1. In a medium bowl, toss the sweet potato wedges with 1 tablespoon olive oil, 1 tablespoon fajita seasoning, and 1 crushed garlic clove. (Image 1) Spread on a large baking sheet and roast for 15 minutes. (Image 2) Keep the bowl for the remaining vegetables.

1. In the same bowl, combine the sliced onions and peppers with 1 tablespoon olive oil, 1 tablespoon fajita seasoning, and the remaining crushed garlic. Set aside. (Image 3)
2. Wrap the tortillas in a stack of aluminium foil and set aside.
3. Remove the sweet potatoes from the oven, flip them, and move them to one side of the baking sheet. Spread the peppers and onions on the empty side. Return to the oven and roast for 12 more minutes, or until sweet potatoes are tender and the vegetables are soft. Place the wrapped tortillas in the oven during the last few minutes to warm. (Image 4)

1. While the vegetables roast, make the zesty lime sauce: Combine Greek yogurt, lime zest, and lime juice in a small bowl. Mix well and set aside. (Image 5)
2. Optional: Broil the vegetables for 2-3 minutes to achieve a slightly crisp edge.
3. Serve the warm sweet potato fajitas on a tray or individual plates. Add the zesty lime sauce, sliced avocado, lime wedges, and any additional toppings you like. (Image 6)