Answer:
Seven brothers, five work all day, The other two, just play or pray.
I'm a small ring shaped fried cake, often with bavarian cream or fruit filling, and sometimes covered in icing and sprinkles.
I occur twice in eternity. And I'm always within sight.
Sometimes it's silver but also gold. Printed on paper it's a treasure to hold. What is it?
What cannot talk but will always reply when spoken to?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.