A "Hole-y" Who Am I Poem

I am breakfast
while on the go.
I resemble
the letter O.

Despite my hole,
I do not leak.
Through my middle
you can peek.

I am eaten plain
or drizzled with icing.
Either way
I'm quite enticing.

Topped with sprinkles
or chopped nuts.
I've been known
to cause big butts.

Who Am I?

(Spoiler: Happy National Doughnut Day!)

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