Look for the windowpane: I use this rather than relying only on the 8 to 10-minute mixing time. Stretch a small piece of dough thinly. If it forms a translucent membrane without immediately tearing, the gluten is well developed.
Add the butter gradually: Don't add the whole cup at once. Give each addition time to work into the dough before adding more.
Let the dough decide the proofing time: The final rise might take 1 hour or 3 hours depending on the temperature of your kitchen. Wait until the dough reaches the top of the mold rather than relying on the clock.
Watch the top: Panettone can brown before the center is finished. Loosely tent it with foil if needed.
Don't skip the upside-down cooling: This is one of the unusual parts of making panettone, but it helps the tall, soft loaf hold its shape as it cools.
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