You say, "¿Qué clase de galleta quieres?"
"Do you want the cookie" in informal Spanish (talking to someone younger or a close relative or friend) is ¿Quieres la galleta?
es una galleta
Gaheta is Spanish for COOKIE
There isn't a proper word for pretzel in Spanish but they say "galleta salada". (literally means "salt cookie")
I am eating a cookie = Estoy comiendo una galleta. Or you could say "Como una galleta." Literally this is "I eat a cookie", but is usually translated into the English progressive.
Does Polly want a cookie?
ComeGalletasorEl Monstruo de las Galletas
There is no word for brownie. Just say brownie or "galleta" (cookie)
To say 'I want bread' in Spanish, you would say 'Yo quiero pan.'
To say 'I want meat' in Spanish, you would say 'Yo quiero carne.'
To say 'I want cereal' in Spanish, you would say 'Yo quiero cereales.'
To say 'I want paper' in Spanish, you would say 'Yo quiero papel.'