Two all beef patties, special sauce, lettuce, cheese, pickles, onions on a sesame bun is also known as a?

Wasn’t it bigger in the 70s?

It’s “sesame seed bun”.

I am a hundred percent that in the 70's, the Big Mac came with two pieces of cheese. When did the 2nd piece of cheese go south??

Why does it need extra bread?

I know that commercial by heart! 2 all beef patties special sauce lettuce cheese pickles and onions on a sesame seed bun!