After the chill, I preheat my oven to 400°F (200°C). I take the log out and, using a sharp serrated knife, slice it into 1-inch thick rounds. I place the rounds cut-side up on the parchment-lined baking sheet, leaving about an inch between them for expansion. I brush the tops lightly with the beaten egg wash—this gives them that beautiful, shiny golden finish. I bake them for 18-22 minutes, until they are puffed up, deeply golden brown, and you can see the cheese bubbling enticingly at the edges. The smell is absolutely irresistible.
Pro Tips for Best Results
I tested the mushroom prep three different ways: slicing, rough chopping, and fine chopping. Fine chopping is the winner. Sliced mushrooms create too much empty space and can make the filling slide out. Finely chopped mushrooms cook down into a almost paste-like, jammy consistency that spreads beautifully and stays put when you roll and slice the log. It creates the perfect textural contrast to the flaky pastry.
Here’s what I learned the hard way about the chilling step: don’t skip it. The first time I was impatient and sliced the log right away. The warm filling made the pastry soft, my knife dragged, and the slices were messy and squished. The 20-minute freezer chill solidifies the butter layers in the pastry and firms up the filling, allowing you to get clean, perfect spirals with a sharp knife. It also helps the pinwheels hold their shape in the oven for that classic, tall spiral look.
For the most even bake and to prevent a soggy bottom, use parchment paper and don’t overcrowd the baking sheet. The hot air needs to circulate around each pinwheel to crisp up all sides. If they’re too close, they’ll steam. I also recommend rotating the baking sheet halfway through the cooking time. My oven has a hot spot in the back, and this ensures every pinwheel gets equally golden and crisp. I’ve tried this both ways, and trust me, the rotation makes a noticeable difference.
Common Mistakes to Avoid
My biggest first-time mistake was not cooling the mushroom filling completely. I was in a rush and spread it onto the pastry while it was still warm. The heat softened the pastry butter, making it sticky, greasy, and nearly impossible to roll tightly. It also created steam inside the roll during baking, which resulted in some separation between the pastry layers. Always, always let the filling cool to room temperature before assembling.(See the next page below to continue…)