Bourbon Thyme Peach Galettes

Name: Bourbon Thyme Peach Galettes
Ingredients: 1 cup (225 g) very cold unsalted butter, cut in small cubes of about 2-3cm; 1 1/4 cup (162 g) all-purpose white flour; 1 1/4 cup (144 g) all-purpose whole wheat flour; 1/2 cup (125 ml) very cold water; 1 teaspoon (5 ml) salt; 2 ripe peaches; 1/3 cup (80 ml) bourbon; 1/2 cup (100 g) brown sugar; 1/2 teaspoon (2.5 ml) salt; 3 sprigs of thyme; 1 large egg yolk; 1 tablespoon (15 ml) heavy cream; a few pieces of raw cane sugar for sprinkling; a few extra sprigs of thyme