My Ultimate Flaky Croissant Recipe: A Baker's Journey

Ingredients

• 3 1/2 cups (420g) all-purpose flour, plus more for dusting
• 1/4 cup (50g) granulated sugar
• 1 teaspoon (6g) salt
• 1 package (7g) active dry yeast
• 1 cup (240ml) lukewarm milk
• 1/4 cup (60ml) cold water
• 2 tablespoons (28g) unsalted butter, melted
• 1 cup (2 sticks, 226g) unsalted butter, very cold (European-style butter preferred)
• 1 large egg, beaten
• 1 tablespoon milk