Fish & Chips with Dipping Sauce

Arrange one oven rack at lowest rack setting; place second rack in middle of oven. Preheat oven to 425°. In a small bowl, mix sour cream, chopped pickle, pickle juice and pepper. Refrigerate, covered, until serving., Cut potatoes into 1/4-in. julienne strips. Rinse well and pat dry. In a large bowl, toss with oil, salt and pepper; transfer to a baking sheet coated with cooking spray. Bake on bottom oven rack until golden brown and tender, 30-35 minutes, turning once., For fish, in a shallow bowl, mix bread crumbs, garlic powder, onion powder, salt and pepper. Place egg whites in a separate shallow bowl. Dip fish in egg whites, then in crumb mixture, patting to help coating adhere., Transfer to a baking sheet coated with cooking spray. Spritz fish with cooking spray. Bake on top oven rack 14-16 minutes or until fish just begins to flake easily with a fork. Serve with fries, sour cream mixture and lemon wedges.