5 from 6 votes
Home » Recipes » Holidays » Halloween » Easy Halloween Cookie Bars

Easy Halloween Cookie Bars

This post may contain affiliate links. Please read my disclosure policy for details.

You’re going to love these easy Halloween Cookie Bars! They’re a great way to make a sweet treat during the spooky time of the year. These are so much better than anything that you’d buy at the grocery store! Trust me when I say that these loaded cookie bars are crazy good.

Halloween theme cookie bars in a cooling rack with black flower decorations on the sides.

These are my favorite way to combine brownies and cookies. These chewy cookie bars offer the most amazing Halloween cookies loaded with spooky sprinkles. They’re so much fun to make!

If you love recipes like this, you may also enjoy these Large Halloween Marshmallow Pops with Candy Melts and Sprinkles! You can never have too many Halloween desserts.

  • It’s an easy recipe that delivers an unbelievable chewy texture
  • It’ll be a huge hit at Halloween parties or a just a simple family treat
  • It’s the perfect treat for the spookiest time of year!

Ingredients Needed

  • Boxes of Brownies mix – Choose your favorite brand.
  • Additional ingredients listed on the Brownie boxes 
  • Creamy peanut butter – Use your favorite brand.
  • Unsalted butter – Make sure it’s at room temperature.
  • Light brown sugar – Pack tight when measuring.
  • White sugar – For sweetness.
  • Eggs – Needed to help bind together the dry ingredients.
  • Pure vanilla extract – Adds flavor!
  • All-purpose flour – You can sift if you’re worried about lumps.
  • Baking soda – Used to help adda chewy texture.
  • Kosher salt – Just a pinch.
  • Quick oats – For texture and chew.
  • Miniature chocolate chips – You can use regular-sized as well.
  • Halloween Sprinkles  – Pick out your favorite.
  • Unsalted sweet cream butter – Make sure it’s softened.
  • Powdered sugar – For the sweetness in the frosting.
  • Heavy whipping cream – Needed for texture.
  • Neon Green gel food coloring – Gel food coloring works best.
  • Mini candy eye decorations – Edible googly eyes!

The complete list of ingredients, quantities, and instructions can be found in the printable recipe card below.

Collage of creating cookie bars.

Step One: Preheat the oven to 350 degrees. Prep 9 X 13-inch baking pan with nonstick baking spray. Line the baking pan with parchment paper with extra on the four sides.

Step Two – Make the brownies

  • Follow the ingredient list and baking directions listed on the back of the boxes. Put the batter in the prepared baking pan. (Photo 1)
  • Set aside. 

Step Three – Make the cookie dough

  • Use the paddle attachment of the electric mixer to combine. 
  • Add the brown sugar, white sugar, eggs, and vanilla. (Photo 2)
  • Beat until completely mixed. 
  • In a second bowl, add flour, baking soda, and salt. (Photo 3)
  • Whisk to blend. 
  • Add the oats and chocolate chips. 
  • Beat to blend all ingredients together. 
  • Use a serving spoon to drop the oatmeal mixture over the brownie batter. Sprinkle the Halloween sprinkles over the top. (Photo 4)
  • Bake at 350 degrees for 25-25 minutes. (Photo 5)
  • Insert a toothpick in the center to see if it is done. 
  • When done, set on a counter for at least 30 minutes to cool. 
  • Remove from the baking pan. 
Collage of a bowl of cookie dough batter mixture and a lined baking dish of brownie batter mixture.

Step Four – Make the frosting

  • Using a standing mixer, beat the butter, powdered sugar, vanilla, and heavy whipping cream with the paddle attachment until combined, creamy, and stiff. 
  • Beat in a few drops of neon green food coloring and mix until blended
  • Scoop the frosting into the piping bag Pipe big and small dollops on the brownies, Place two mini candy eyes in the frosting. Allow frosting to firm up before enjoying!
Halloween cookie bars sitting on a black cooling rack.

Storing Leftovers

If you have any left, you just need to store them in an airtight container at room temperature. They should stay fresh for 2-3 days.

Cookie bars with sprinkles and green candy eye decorations sitting on a cooling rack.

Substitutions or Variations

You can easily make leftover Halloween candy cookie bars! Just add candy bars pieces or Reese’s pieces and have fun! These can take the place of chocolate chips.

Recipe FAQs

Can you freeze these cookie bars?

You can! Just let them cool down all the way and then add them to freezer-safe bags or containers. Eat them within 3 months for the best flavor and taste.

What are other toppings to add to the top of the bars?

You can easily add more fun sprinkles or even candy pieces. It’s totally up to you if you want to change up the toppings and frosting.

More Halloween Recipes You’ll Love

Did you make this recipe? Or any other delicious recipes on my site? If so, please leave a ★★★★★ star rating and drop a 📝 comment below! Ensure you’re not missing a thing; you can subscribe to my newsletter and follow along with me on Pinterest, Facebook, and X (Twitter)! for the latest updates, recipes, and content.

Cookie bars with Halloween themed sprinkles and mini candy eyeballs.
5 from 6 votes

Easy Halloween Cookie Bars


Author: Kim Schob
Course: Desserts
Cuisine: American
Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes
Everyone will love these Easy Halloween Cookie Bars. They're a great way to make a spooky fun and delicious Halloween treat.

Ingredients 

To make the brownies:

  • 2 boxes Brownie mix
  • other ingredients listed on the brownie box

To make the cookie dough:

To make the vanilla frosting:

  • ½ cup (113 ½ g) unsalted sweet cream butter softened
  • 2 cups (240 g) powdered sugar
  • 2 tsp pure vanilla extract
  • gel food coloring neon green
  • mini candy eyeballs

Instructions

  • Preheat oven 350 °F (177 °C) degrees
  • Prep 9 X 13 inch baking pan with nonstick baking spray. Line the baking pan with parchment paper with extra on the four sides.

To make the brownies:

  • Follow the ingredient list and baking directions listed on the back of the boxes.
  • Put the batter in the prepared baking pan. Set aside.

To make the cookie dough:

  • Add the peanut butter and soft butter in a mixing bowl.
  • Use the paddle attachment of the electric mixer to combine.
  • Add the brown sugar, white sugar, eggs, and vanilla.
  • Beat until completely mixed.
  • In a second bowl add flour, baking soda and salt.
  • Whisk to blend.
  • Add the oats and chocolate chips.
  • Beat to blend all ingredients together.
  • Use a serving spoon to drop the oatmeal mixture over the brownie batter.
  • Sprinkle the Halloween sprinkles over the top.
  • Bake at 350 °F (177 °C) degrees for 25-25 minutes.
  • Insert a toothpick in the center to see if it is done.
  • When done, set on a counter for at least 30 minutes to cool.
  • Remove from the baking pan.

To make the frosting:

  • Using a standing mixer, beat the butter, powdered sugar, vanilla and heavy whipping cream with paddle attachment until combined, creamy and stiff
  • Beat in a few drops of neon green food coloring and mix until blended
  • Scoop the frosting into the piping bag
  • Pipe big and small dollop on the brownies
  • Place two mini candy eyes in the frosting
  • Allow frosting to firm up before enjoying!

Nutrition Information

Calories: 501kcal (25%) Carbohydrates: 77g (26%) Protein: 6g (12%) Fat: 20g (31%) Saturated Fat: 8g (50%) Polyunsaturated Fat: 2g Monounsaturated Fat: 7g Trans Fat: 0.3g Cholesterol: 35mg (12%) Sodium: 284mg (12%) Potassium: 77mg (2%) Fiber: 1g (4%) Sugar: 56g (62%) Vitamin A: 246IU (5%) Vitamin C: 0.03mg Vitamin D: 0.2µg (1%) Calcium: 20mg (2%) Iron: 2mg (11%)

Hungry for more?

Follow me on Pinterest and make sure to comment below!

Get 3 FREE Conversion charts + Bonus!

When you subscribe to the latest updates, recipes, and content.

Leave a Reply

Your email address will not be published. Required fields are marked *

Recipe Rating




This site uses Akismet to reduce spam. Learn how your comment data is processed.

5 Comments

  1. 5 stars
    I made these cookie bars with the kids over the weekend and they were so fun to make! The kids loved adding the eyeballs!

  2. 5 stars
    I like how convenient these brownies are using a box mix. And the layer of cookie dough makes this a delicious treat! Thanks for sharing.

  3. 5 stars
    Love this Easy Halloween Cookie Bars recipe, looks delicious and easy to make, perfect for Halloween!! Love the decoration. Thanks for sharing 🙂

You May Also Like...