3 pounds sweet potatoes, peeled and cut into 3/4-inch pieces (about 7 cups)
1/4 cup finely chopped sweet onion
1/4 cup finely chopped celery
1/4 cup finely chopped seeded fresh poblano pepper
1 jalapeno pepper, seeded and finely chopped
1 cup mayonnaise
2 tablespoons lime juice
1/2 to 1 teaspoon ground chipotle pepper
1/2 teaspoon salt
1/4 teaspoon pepper
Minced fresh cilantro
Preheat oven to 425°. Place sweet potatoes in a parchment-lined 15x10x1-in. baking pan; cover tightly with foil. Roast until tender, 25-30 minutes. Cool. Transfer to a large bowl.
Add onion, celery, poblano and jalapeno. Combine mayonnaise, lime juice, chipotle pepper, salt and pepper; pour over potato mixture and toss gently to coat. Refrigerate, covered, until serving. Sprinkle with cilantro.