Tropical Sweet Potato Salad

Name: Tropical Sweet Potato Salad
Prep time: 20 min
Cook time: 35 min
Total time: 55 min
Cuisine: American
Ingredients: 3 pounds sweet potatoes, peeled and cut into 1/2-inch cubes; 1 medium mango, peeled and cut into 1/2-inch cubes; 1 medium red onion, thinly sliced; Cooking spray; 1-1/2 tablespoons chili powder; 1/4 teaspoon salt; 1/4 teaspoon pepper; 1/2 cup Miracle Whip; 1/4 cup plain Greek yogurt; 2 tablespoons thawed pineapple juice concentrate; 2 serrano peppers, seeded and finely chopped, veins removed; Thinly sliced serrano pepper, optional