I may come in groups of Twelve, What am I ?

I may come in groups of twelve,
From farms or from a store,
The thing that made me,
Made many of me galore!

I could give birth to a creature,
Or be eaten by you,
For breakfast, lunch, or dinner,
Now here's your last clue.

I have walls and floors of white
A disco ball in the middle,
A very round one that's yellow,
And I am very little.

What am I?

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