1/2 cup (113 grams) unsalted butter, (at cool room temperature), 1/2 cup (100 grams) granulated sugar, 1/4 cup (50 grams) brown sugar, 1 teaspoon vanilla extract, 1 egg, (at room temperature), 1 cup (127 grams) all-purpose flour, 1/2 cup (43 grams) black cocoa powder (or Dutch-process),, 1 tablespoon cornstarch, 1 teaspoon fine sea salt, 1/2 teaspoon baking soda, 1/4 teaspoon baking powder, 1/2 cup (85 grams) white chocolate chips, (plus more for garnish), 1 cup (218 grams) Halloween M&MS, (plus more for garnish), Edible candy eyeballs,

1 cups unsalted butter (softened), 1 cup sugar, 2 eggs, 1 teaspoon vanilla extract, 1 teaspoon almond extract, 1/2 teaspoon salt, 1 teaspoon baking soda, 3 cups all-purpose flour, 1-2 containers white Betty Crocker cookie icing, 1-2 containers black Betty Crocker cookie icing, round red sprinkles (optional), black edible food marker, black decorating sugar (sometimes called sprinkles or sanding sugar)

1 and 1/2 cups (188g) all-purpose flour (spooned & leveled), 3/4 cup (62g) unsweetened natural cocoa powder (or dutch process cocoa powder), plus more as needed for rolling and work surface, 1 teaspoon baking powder, 1/8 teaspoon salt, 3/4 cup (12 Tbsp; 170g) unsalted butter, softened to room temperature, 1 cup (200g) granulated sugar, 1 large egg, at room temperature, 1 teaspoon pure vanilla extract, Royal Icing or Easy Cookie Icing, optional: gel food coloring for tinting icings

1 cup (222g) salted butter, room temperature, 1 cup (233g) granulated sugar, 2 tsp vanilla extract, 1 egg, 3 cups (456g) all-purpose flour, 2 tsp baking powder, 1 batch Sugar Cookie Frosting

½ cup (113g) unsalted butter (softened), ¾ cup (150g) brown sugar (packed), 1 teaspoon vanilla extract, 1 large egg, 1 3.4 ounces box Instant Vanilla Pudding Mix, ½ teaspoon baking soda, ¼ teaspoon salt, 1 ¼ cups (155g) all purpose flour, ¼ cup Halloween sprinkles, ¾ cup Halloween M&Ms (any flavor ), Candy eyes (optional)

1 stick unsalted butter ((8 tablespoons) at room temperature), 1 cup granulated sugar, 1 large egg, 1 teaspoon vanilla extract, 1 cup plus 2 tablespoons all-purpose flour, 6 tablespoons unsweetened cocoa powder, 1/2 teaspoon baking soda, 1/2 teaspoon kosher salt, 1/2 cup plus 2 tablespoons M&Ms Ghoul's Mix, 1/2 cup Reese’s Pieces, 1/2 cup semisweet chocolate chips, 1/3 cup Halloween sprinkles, 2 tablespoons candy eyeballs

4 cups flour, 1 tsp baking powder, 1/2 tsp salt, 1 1/2 cups butter (softened), 1 1/2 cups granulated sugar, 2 large eggs, 2 tsp vanilla, gel food coloring (green and purple)

2 1/4 cups all-purpose flour, 1 teaspoon baking soda, 1 teaspoon salt, 1 cup (2 sticks) unsalted butter, at room temp, 1/2 cup sugar, 1 cup packed light brown sugar, 1 1/2 teaspoons vanilla extract, 2 large eggs, 2 cups semisweet chocolate chips, plus more for topping, Chocolate candy melts (See Kelly's Notes), Candy eyes

10 tablespoons (142g) unsalted butter, at room temperature or cold, 1 cup (198g) granulated sugar, 1/2 teaspoon table salt, 1/4 teaspoon espresso powder, 1 large egg, 2 teaspoons King Arthur Pure Vanilla Extract, 1 cup (120g) King Arthur Unbleached All-Purpose Flour or King Arthur Gluten-Free Measure for Measure Flour, 2/3 cup (56g) black cocoa, sifted if lumpy*, 3 tablespoons (21g) cornstarch, 3/4 teaspoon baking soda, 1 packet natural orange food coloring, 1 teaspoon King Arthur Pure Vanilla Extract, 4 to 5 teaspoons water, divided, 1 cup (113g) confectioners' sugar, sifted if lumpy

2 ¼ cups (280 g) all-purpose flour, 1 teaspoon cornstarch (optional), ½ teaspoon baking soda, ½ teaspoon salt, ¾ cup (170 g or 1 1/2 sticks) unsalted butter (melted and slightly cooled), 1 cup (200 g) packed light brown sugar, ½ cup (100 g) granulated sugar, 1 large egg (room temperature), 1 egg yolk (room temperature), 2 teaspoons pure vanilla extract, 1 cup Halloween M&M's (if you can’t find them in-store, pick out blue and red m&ms from regular m&ms), ¼ cup Halloween sprinkles with candy eyes