Easy Vanilla Bean Christmas Lights Cookies

Bahan-bahan (22 porsi)

• 1 1/2 sticks (12 tablespoons) salted butter, at room temperature
• 3/4 cup granulated sugar
• 1 teaspoon vanilla bean powder, or 1 tablespoon vanilla extract
• 1 tablespoon hazelnut liquor ((optional))
• 1 egg, at room temperature
• 2 cups all-purpose flour, plus an additional 2-4 tablespoons, if needed
• 1/2 teaspoon baking soda
• 1/2 teaspoon kosher salt
• 2 cups powdered sugar
• 1 tablespoon maple syrup
• 2 teaspoons vanilla extract
• 1/2 cup chocolate chips, melted
• mini holiday M&M's and vanilla sugar for decorating