Why do my bao buns spread sideways?
A bun that spreads before steaming is not the same problem as one that rises normally and collapses later. First identify when the shape was lost.
Diagnose my bao →Do not change anything yet.
The final symptom is not the cause. Use the details you can actually observe to narrow the next test.
Use the timing and the strongest visible clue.
1. Spreading during final proof?
Very soft dough or an advanced proof state can reduce shape retention. Do not add flour automatically; first compare dough feel and proof endpoint.
2. Tall before steaming, flat afterward?
That overlaps the collapse branch. Strong over-proof cues or post-steam structure loss are more relevant than shaping alone.
3. Dough much softer than usual?
Hydration changes gluten-network structure and steamed-bread quality. A measured formula difference is stronger evidence than the final flat shape by itself.
Photograph the buns immediately after shaping and again just before steaming. If they spread during proof, keep the formula fixed and test an earlier proof endpoint. If they stay tall until steaming, use the collapse diagnosis instead.
Evidence: Red House Spice — proof state, bun spacing and collapse; Study — hydration level and gluten-network behavior.
Quick answers
Why do my bao spread during proofing?
A very soft dough or a late proof state can contribute, but the timing of the spread is more useful than the final shape alone.
Is sideways spread the same as collapse?
Not always. If the bun spreads before steaming, diagnose proofing and dough feel first. If it loses volume after steaming, use the collapse branch.
Should I add more flour?
Only if you have a direct softness or measurement clue. Random flour changes can create a new problem.
Let the next batch answer one question.
Bao Rescue asks a few observable questions, keeps weak evidence weak, and gives one next-batch test instead of a long list of generic fixes.
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