Preheat the Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

Mix the Butter and Sugars: In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy.

Add the Egg and Vanilla: Beat in the egg and vanilla extract until well combined.

Combine Dry Ingredients: In a separate bowl, whisk together the flour, baking soda, and salt.

Combine Wet and Dry Ingredients: Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Fold in Mix-Ins: Gently fold in the chocolate chips, M&M's, and candy eyeballs, ensuring they are evenly distributed throughout the dough.

Shape the Cookies: Using a cookie scoop or your hands, form balls of dough (about 2 tablespoons each) and place them onto the prepared baking sheet, leaving space between each cookie to allow for spreading.

Add Extra Eyeballs: Press a few additional candy eyeballs onto the top of each cookie for a spooky effect.

Bake: Bake in the preheated oven for 10-12 minutes or until the edges are lightly golden but the centers are still soft.

Cool and Serve: Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.

Enjoy: Serve these spooky cookies at your Halloween party or as a festive treat!