no, its optional. if you prefer to not have nuts or are allergic to them you can just take them out of the recipe
More information:
In the USA, the nut commonly used in brownies is the walnut. It would be very unusual indeed to find brownies with hazelnuts (filberts) in America.
Chocolate isn't made from hazelnuts. Often hazelnuts or hazelnut butter is combined with chocolate because the flavors compliment each other. There is a product made from hazelnuts that's flavored with chocolate and it's called Nutella.
No. It contains flour- great for brownies, yuck for drinking.
white chocolate or cheesecake brownies!
The main use of chocolate is for consumption. Most commonly, this is through chocolate bars, chocolate morsels, and in baked goods like cookies, brownies, and cakes.
Brownies are called brownies because they are brown.
The frosting on brownies is simply a chocolate icing, or frosting, usually thick and spreadable, used to top chocolate brownies.Americans use the word frosting where in England we would say icing.
Brownies are a sweet dessert that are like eating chocolate but not that sweet
Brownies are a delicious food usually containing lots of chocolate
Brownies are denser. The proportions of sugar / fat / flour are different in brownies and chocolate cakes. Brownies have relatively little flour and more cocoa (or chocolate) than chocolate cakes have. That is why one eats a much smaller piece of brownies than one eats of chocolate cake.
chocolate
Not even remotely. Brownies are primarily sugar, butter and chocolate.
Nutella is made from hazelnuts and chocolate!