Richardson’s may be the first winner in a brand-new category, but this Deerfield business is a tried-and-true Valley fixture. This year is fast-paced, says owner Kathie Williams, because the mild winter made for good holiday sales, and Easter came early this year. “Our holiday seasons drive us,” she says. The kitchen opened in 1954, and Williams’ family bought the business in 1983. “Tradition is very strong for us,” she says. “People want to see their favorites, but we try to introduce new ideas and products. Sea-salted sweets have become quite the craze in recent years, for example, as has white chocolate with peanut butter — which Richardson’s now makes regularly.