Spiced Pumpkin Shortbread Cookies

Bahan-bahan (24 porsi)

• 1 1/2 sticks (12 tablespoons) salted butter, at room temperature
• 1/2 cup pumpkin butter
• 1 tablespoon vanilla extract
• 1/4 cup brown sugar
• 2 cups all-purpose flour
• 2 teaspoons pumpkin pie spice
• 1 large egg, beaten
• 1/2 cup coarse turbinado sugar
• 1 tablespoon cinnamon
• flaky sea salt
• 1 1/2 cups semi-sweet or milk chocolate, melted