Just when you thought the cupcake craze was losing steam in Austin, along comes Los Angeles-based Sprinkles. The cupcake bakery from Candace Nelson, a judge on the Food Network’s “Cupcake Wars,” opened over the weekend at 3120 Palm Way in the Domain Northside. In addition selling 50 flavors of cupcakes baked in small batches throughout the day, cookies and ice cream, Sprinkles also has a 24-hour cupcake ATM that distributes cupcakes around the clock.