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Monster Cookies

These Monster Cookies are soft, chewy, crunchy and full of delicious peanut butter flavour! This easy recipe makes a big batch, so enjoy some now, freeze some for later. These truly are the best monster cookies!

a top down image of a tray of monster cookies

About these cookies:

These monster cookies are a peanut butter oatmeal cookie loaded up with yummy chocolate candies. So if you’re looking for a thick and chewy peanut butter cookie these are it!

a top down image of a tray of monster cookies

Fun for Halloween!

These cookies are a perfect cookie for any time of year, but they’re especially fun for Halloween, after all they are called Monster Cookies! Make them super fun by dressing them up with candy corn or candy eyeballs, kids love this! You can even make these cookies for any time year…add red and green candies and make them Christmas monster cookies, or pink and red for Valentine’s Day, the possibilities are endless.

a top down image of a tray of monster cookies

Makes a big batch.

One of the greatest things about baking these chewy monster cookies is how your house will smell when they’re in the oven, like a scrumptious bakery!  And to top it all off, the best part is that this recipe makes a huge batch of cookies (about 4 dozen medium sized cookies), so you will have plenty to enjoy and plenty to freeze for later. Big batch cookie baking is the best.

Monster Cookie Recipe Tips

  • PEANUT BUTTER: Use creamy peanut butter (smooth or chunky peanut butter), NOT natural peanut butter.
  • OATS: You can use old-fashioned oats or quick oats for these cookies.
  • CORN SYRUP: If you don’t have corn syrup feel free to substitute it with honey.
  • CANDY ADD INS: You can use milk chocolate chips, semisweet chocolate chips, peanut butter chips, butterscotch chips, Reese’s Pieces, white chocolate chips or m&m candies.
  • OTHER CANDY OPTIONS: You add extra candy corn, sprinkles or candy eyeballs to the top of the cookies before baking.
  • STORAGE: Keep in an airtight container.
  • FREEZING: These cookies freeze well. Keep in a ziplock freezer bag or airtight container in the freezer for up to 3 months.
a top down image of a tray of unbaked monster cookies

Chewy Cookie Tip!

If you like soft and chewy cookies, bake them for 11-12 minutes. But if you like a more crunchy cookie bake them a little longer, about 12-15 minutes.

a tray of monster cookies
Print

Monster Cookies

a top down image of a tray of monster cookies

These Monster Cookies are soft, chewy, crunchy and full of delicious peanut butter flavour! This easy recipe makes a big batch, so enjoy some now, freeze some for later. These truly are the best monster cookies!

  • Author: Jo-Anna Rooney
  • Prep Time: 15 minutes
  • Cook Time: 1 hour, 30 minutes
  • Total Time: 1 hour 45 minutes
  • Yield: 48 medium cookies 1x
  • Category: Cookie
  • Method: Baking

Ingredients

Units Scale
  • 3 large eggs
  • 1 cup brown sugar
  • 1 cup white sugar
  • 1 tsp vanilla extract
  • 1 tsp corn syrup
  • 2 tsp baking soda
  • 1/2 tsp salt
  • 1/2 cup butter (melted)
  • 1 1/2 cup creamy peanut butter
  • 4 1/2 cups old fashioned rolled oats
  • 1/2 cup all purpose flour
  • 2/3 cup Reese’s Pieces (peanut butter)
  • 2/3 cup chocolate chips

Instructions

  1. Preheat your oven to 350 degrees F.
  2. Using a stand mixer with the paddle attachment, combine the eggs, sugars, vanilla, corn syrup, baking soda and salt.
  3. Add in the peanut butter and melted butter. Make sure to scrape the sides of the bowl and mix well.
  4. Add the flour, and oats. Combine.
  5. Then add in the Reese’s Pieces and chocolate chips, but mix these in by hand so they don’t break.
  6. Drop these as 2 heaping tablespoon balls onto a parchment paper lined baking sheet (you can use a cookie scoop to shape them). About 8 to a tray, and flatten the cookie dough balls slightly.
  7. I added some candy eyeballs and extra Reese’s Pieces to the tops of the unbaked cookies for decoration.
  8. Bake for 11-12 minutes. I like mine a bit chewy, but if you like your cookies harder, bake for 12-15 minutes.
  9. Let the cookies cool on the pan for about 5 minutes before transferring them to a wire rack.

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I hope you enjoy these classic monster cookies are much as we do! Have a delicious day!

Monster Cookies
Monster Cookies

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15 Comments

  1. I was looking for a fun cookie recipe to make with my son and this is perfect! I’ll just have to fight the temptation to eat my candy corn before they make it in the mix.

    Erin