Step 1: Preheat the Oven

• Preheat your oven to 350°F (175°C). This will ensure your cookies bake evenly.

Step 2: Prepare the Baking Sheets

• Line two baking sheets with parchment paper or silicone baking mats. This makes for easy cleanup and prevents sticking.

Step 3: Mix the Dry Ingredients

• In a medium bowl, whisk together the flour, baking soda, and salt. This helps to evenly distribute the leavening agent throughout the cookies.

Step 4: Cream the Butter and Sugars

• In a large mixing bowl, cream the softened butter, granulated sugar, and brown sugar until light and fluffy. This should take about 2-3 minutes with a hand mixer or stand mixer.

Step 5: Add the Eggs and Vanilla

• Beat in the eggs, one at a time, mixing well after each addition. Then, add the vanilla extract and mix until combined.

Step 6: Combine Wet and Dry Ingredients

• Gradually add the dry mixture to the wet mixture, mixing just until combined. Be careful not to overmix; this keeps your cookies soft and tender.

Step 7: Fold in the Chocolate Chips

• Gently fold in the chocolate chips (and any other mix-ins you’d like!). If you’re feeling festive, toss in some fun Halloween candies for extra color.

Step 8: Scoop the Cookie Dough

• Using a cookie scoop or a tablespoon, drop rounded balls of dough onto the prepared baking sheets, spacing them about 2 inches apart.

Step 9: Bake the Cookies

• Bake for 10-12 minutes, or until the edges are golden and the centers are still soft. Don’t worry if they look slightly underbaked; they’ll firm up as they cool.

Step 10: Cool the Cookies

• Let the cookies cool on the baking sheet for about 5 minutes, then transfer them to a wire rack to cool completely.

Step 11: Make the Monster Milk

• While the cookies are cooling, let’s whip up the monster milk! In a medium bowl, whisk together the milk, heavy cream, powdered sugar, and vanilla extract until smooth.

Step 12: Add the Color

• Divide the milk into separate containers if you want multiple colors. Add a few drops of food coloring to each container and stir until you achieve your desired shades. Get creative—mix colors for a fun effect!

Step 13: Serve the Milk

• Pour the colorful monster milk into tall glasses. Top with whipped cream, if using, and sprinkle with fun decorations like sprinkles or gummy worms.

Step 14: Assemble the Cookie Sandwiches

• Take two cookies and spread a generous amount of monster milk mixture (you can also use whipped cream or frosting) in between. Gently press them together to form a sandwich.

Step 15: Get Creative!

• Decorate the edges of the cookie sandwiches with more sprinkles or candies for that extra festive flair!