history of brownies

Brownies were first made in the United States in the late (a)   .

One story says a chef forgot to add (a)   to a cake, making the dessert dense and fudgy.

Another story claims a woman wanted to bake a small cake but accidentally made (a)   .

Brownies became popular in the early 1900s when they were included in c--------

(a)  

he main ingredients of brownies are chocolate or cocoa, sugar, butter, and (a)   .