Speculoos Buttons

Ingredients

• 2 cups all-purpose flour
• 1 tablespoon ground cinnamon
• 3/4 teaspoon ground ginger
• 1/2 teaspoon fine sea salt
• 1/2 teaspoon freshly grated nutmeg
• 1/8 teaspoon ground cloves
• 1/2 cup (1 stick) unsalted butter, room temperature
• 1/2 cup (packed) light brown sugar
• 1/4 cup sugar
• 2 tablespoons mild-flavored (light) molasses
• 1 large egg, room temperature
• 1 teaspoon vanilla extract
• 1 large egg white
• Sanding or other decorative sugar
• 2 cups powdered sugar, sifted
• Sprinkles, colored sanding sugar, or dragees (optional)