In the early 1920s, a major expansion occurred when the company modernized its factory with the installation of automatic (starch) moguls. Brock then eliminated all slab-produced products such as peanut brittle and fudge and concentrated on jelly and marshmallow candies, which were produced, in his new mogul equipment. Later in the decade, Brock became one of the first candy manufacturers to package its products in cellophane bags. In the 1930s, Brock introduced what would become one of its biggest sellers for the next 60 years, Chocolate Covered Cherries. In the 1940s, during World War II, Brock introduced the Brock Bar, a coated nut roll using corn syrup and peanuts, during a period when sugar was strictly rationed.