1Heat oven to 425°F. Spray large cookie sheet with cooking spray. Place 3/4 teaspoon of the seasoning in 1-gallon resealable food-storage plastic bag; add potatoes. Seal bag; shake until potatoes are evenly coated. Place potatoes in single layer on cookie sheet; spray lightly with cooking spray. Bake 20 minutes or until bottoms are golden brown. Turn potatoes; bake 10 to 15 minutes longer or until tender and bottoms are golden brown.
2Meanwhile, in small bowl, stir sour cream, sriracha sauce, cilantro and remaining 1/4 teaspoon seasoning; refrigerate until ready to serve.
3Serve fries warm with spicy sour cream.