Question: When did the chocolate brownie become popular?
About the article "Chocolate brownie", section "Abstract".

Candidate passages:
Brownie Chocolate was a whey-based chocolate drink. 
Contrary to popular belief, German chocolate cake did not originate in Germany.
Its roots can be traced back to 1852 when American Sam German developed a type of dark baking chocolate for the American Baker's Chocolate Company.
The brand name of the product, "Baker's German's Sweet Chocolate", was named in honor of him.
On June 3, 1957, a recipe for "German's Chocolate Cake" appeared as the "Recipe of the Day" in the Dallas Morning Star.
It was created by Mrs. George Clay, a homemaker from 3831 Academy Drive, Dallas, Texas.
This recipe used the baking chocolate introduced 105 years prior and became quite popular.
General Foods, which owned the Baker's brand at the time, took notice and distributed the cake recipe to other newspapers in the country.
Sales of Baker's Chocolate are said to have increased by as much as 73% and the cake would become a national staple.
The possessive form (German's) was dropped in subsequent publications, forming the "German Chocolate Cake" identity we know today and giving the false impression of a German origin.
The recipe still remains popular to this day and has been adopted by baking companies.
June 11 is National German Chocolate Cake Day in America. 
There are three main myths about the creation of the brownie.
The first, that a chef accidentally added melted chocolate to biscuit dough.
The second, a cook forgot to add flour to the batter.
And thirdly, the most popular belief, that a housewife did not have baking powder and improvised with this new treat.
It was said that she was baking for guests and decided to serve these flattened cakes to them.
All three myths have gained popularity throughout the years. 
Brownie Brittle was invented by Sheila G. Mains in Palm Beach, Florida, as a part of Sheila G Brands.
Mains had been a commercial brownie baker since 1992, and eventually purchased the telephone number 1-800-Brownie.
The first theme-park that ordered her brownies for sale in their park placed an order for 37,000 brownies.
Eventually, she was baking and selling up to 1.6 million brownies a year.
Among her clients, she was the producer for brownies at Disney World since 1994.
The first incarnation of Brownie Brittle was called "Brownie Crisps," however they did not take off.
The idea for brownie brittle and the crisps came from the hardened drippings that would come off the pans used in her plant, and she developed a new type of process that would only produce crispy brownie edges.
The company relaunched “Brownie Crisps” as Brownie Brittle and the renamed product was first sold in retail stores in April 2011.
It was the first commercial brownie crisp company in the United States.
In 2012 the company received $8 million in sales, and received the “Best New Snack Product” prize at the National Confectionery Sales Association awards ceremony.
Also in 2012 Brownie Brittle was nominated as one of the most innovative new products at the Sweets And Snacks Expo and had sold more than two million bags of the product.
Brownie Brittle also entered a partnership with Weinstein Co. to provide snacks for movie premiers, as well as their Golden Globe and Oscar events.
The flavors of Brownie Brittle are Chocolate Chip, Toffee Crunch and Traditional Walnut. 
  Chocolate brownie, a baked good  Brownie (folklore), a legendary creature  Brownie (camera)  Brownie (Girl Guides), a level in several guiding/scouting organizations  Brownie, in Woodcraft Indians scouting, for girls and boys ages 6–11