Line baking sheets with parchment paper. Add sweet potatoes and spread out evenly. Spray with olive oil and season with salt and pepper.
Bake for 35-40 minutes or until crispy.
Meanwhile, for the aioli, combine greek yogurt, lime juice and chipotle pepper in a blender. Puree well and taste for seasoning and spiciness. If you want it spicier, add more liquid from the chipotle in adobo can. Serve with fries and devour!