Bake Flaky Croissants - Classic Swiss Gipfeli

Ingredients

• 4 cups all-purpose flour (500g)
• 1/2 cup whole milk, warmed to about 110°F (125ml)
• 1/2 cup water, warmed to about 110°F (125ml)
• 1/4 cup granulated sugar (50g)
• 2 teaspoons active dry yeast
• 1 teaspoon salt
• 3 tablespoons unsalted butter, melted and cooled (45g)
• 1 cup unsalted butter, cold and cut into slices (225g)
• 1 large egg