adding sugar to muffin recipe

my bf made a batch of corn muffins that oozed over the sides, made one huge muffin essentially, and took a good extra seven minutes to bake. I think he added extra sugar, would that have caused that? It's a cooks illustrated recipe that I've made before and never had a problem with.

Reply to
Marge
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Maybe some of the ingredients were stale or expired.

Reply to
Caya

excess sugar will lower the muffin batter viscosity making it prone to such fault you mentioned

Reply to
chembake

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