In a large mixing bowl, combine flour, butter, sugar, eggs, and salt. Mix until the dough is smooth and well combined, around 3-5 minutes.

Roll dough into balls, create a dent in the center, and fill with jam for Blood-Sprinkled Eyes. Use a toothpick to add 'blood vessels'.

Roll out and cut into shapes for Jack Skellington, fill with jam for the facial features, and drizzle melted chocolate on top after baking.

Shape the dough into finger-like forms for Fingers, scoring to create knuckles, flattening for nails, then decorate with chocolate post-bake.

Use cookie cutters to make fun shapes and decorate creatively with royal icing or melted chocolate for Figure Cookies.

Arrange cookies on a baking sheet lined with parchment paper. Bake in a preheated oven at 180°C (350°F) for about 10-12 minutes, or until golden brown.

Allow cookies to cool completely on a wire rack before decorating for best results.