Todd Gilchrist editor Breakfast is often called the most important meal of the day. It’s also long been a fixture of Jerry Seinfeld’s comedy — from “The Tonight Show” routines about Cookie Crisp to the Honeycomb and Raisin Bran boxes lining the shelves of his cupboards on “Seinfeld.” His directorial debut, “Unfrosted,” brings the obsession full circle, chronicling the 1960s origins of Kellogg’s Pop-Tart.
