Line baking tray with parchment paper and place croissants seam side down onto the pan, with a few inches between each pastry. Allow to rise overnight (8-10 hours).
Preheat oven to 350 F. If (optional) egg wash is desired, beat one egg with a tablespoon of water and coat the top of each croissant.
Bake for 20-25 minutes, until tops are golden brown. Allow to cool for about 10 minutes, then enjoy!
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Notes
For a pretty presentation without egg wash, you can dust croissants with powdered sugar after baking instead.
Nutrition information is provided as a courtesy and is an estimate. It is recommended to use your preferred calculator with the actual ingredients you use for optimal accuracy.