break through


Senior Member

I am watching "The Great British Bake off" and there is a line that I don't understand.
In a scene, when one of the participants is baking her bread in the oven, she says,

"It hasn't broken through the sides so, actually I quite like it broken through the sides but it's not good when you're under scrutiny is it really?"

What does this "broken through "mean?
Does this mean "split"?
Would someone explain please?

Thank you!
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