Triple Peanut Butter Monster Cookies

These cookies are a peanut butter lovers dream! Thick, chewy, soft monster cookies loaded with peanut butter, oats, peanut butter chips, and reeses pieces. These are insanely delicious & addicting! A tall glass of cold milk is a must have.

Triple Peanut Butter Monster Cookies- a peanut butter lovers dream! Big, thick, chewy, and soft cookies.

So, I like to think I have some sort of self-control when it comes to sweets. These cookies proved me way wrong! I am a sucker for peanut butter in dessert, oddly though I don’t care for it by itself. Add in even more peanut butter goodies, oats, and a thick and chewy cookie……… ahhhh, I’m in heaven!

Triple Peanut Butter Monster Cookies- a peanut butter lovers dream! Big, thick, chewy, soft cookies.

Trust me, these are so good and worth every calorie. I had several of them, so I would know 🙂 I think about making them Every. Day. , for real. The secret is the cornstarch, the decreased amount of flour, and the size of the cookie. The recipe calls for a 1/4 cup sized cookie, which makes the cookie super thick, soft, and chewy (just how I like them). I mean you could make smaller cookies, but what fun would that be when you can have a giant cookie?!

Triple Peanut Butter Monster Cookies

Serving Size: 12-15 large cookies


  • 1/2 cup butter (1 stick), softened
  • 1 cup brown sugar
  • 1/2 cup creamy peanut butter
  • 1 large egg
  • 2 teaspoons vanilla extract
  • 3/4 cup flour
  • 1 teaspoon baking soda
  • 1 teaspoon cornstarch
  • 1/4 teaspoon baking powder
  • 1/8 teaspoon (a pinch) of salt
  • 1 1/2 cups old-fashioned oats [NOT quick or 1-minute oats)
  • 1 cup peanut butter chips
  • 1 cup reeses pieces (the ones found in the baking aisle, they're mini)


  1. Preheat oven to 350 degrees and line baking sheets with parchment paper or a silpat.
  2. In a large bowl, cream together the butter, brown sugar, and peanut butter with a hand or stand mixer until light in color and fluffy, about 3-4 minutes. Mix in the egg and vanilla, scraping down the sides of the bowl as needed.
  3. In a separate bowl, add the flour, baking soda, cornstarch, baking powder, and salt and whisk to combine.
  4. With the mixer on low speed, slowly add the flour mixture to the wet ingredients and mix until just combined. Stir in the oats, peanut butter chips, and reeses pieces by hand.
  5. Measure out 1/4 cup balls of dough and place them on the baking sheets. Bake the cookies for 11-12 minutes until the edges are just starting to brown and the top still looks slightly undercooked.
  6. Remove from the oven and cool for 5 minutes on the baking sheet before moving them to a wire rack to cool completely.


** If you use unsalted butter, increase the salt to 1/4 teaspoon

** I like to slightly flatten out the dough balls after they are on the baking sheet, not much just a little bit. I like doing this because then the cookies will be more of a round cookie shape instead of a ball type shape after cooking.

** for a pretty cookie, place a few of the reeses pieces on top of the dough balls

** If you make regular sized cookies, watch the cooking time, you will not need to bake them for 11-12 minutes. I would start like at 8-9 minutes and then see.

** TIP for the softened butter: Place the stick in the microwave (straight from the fridge) and set the microwave for 30 seconds. Every 3 seconds, open the door and flip your stick of butter to another side, then microwave for 3 seconds more…… repeat that until the butter is just barely soft, you don’t want any melted spots. It should still look like a stick of butter, just soft. I only flip the butter like 4 times and its done, it does not take long. I hope this makes sense, if not, leave me a comment and I will do my best to clarify 🙂

Just a little housekeeping: My husband I have updated the visual recipe index in the blog menu, so you should go check it out 🙂 While you’re checking things out, you should totally follow us on Instagram & Facebook, we love new friends. Thank you so much for visiting & I hope you have an excellent day!


recipe adapted from Love Grows Wild

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  1. says

    Ah! I love this! Why have I never thought of doing all peanut butter?! I was trying to come up with one more cookie to make for a couple of parties I have coming up… and I think you have won me over! Pinning, yumming and drooling!

    • Together As Family says

      These cookies are dangerous! Your comment made me laugh 🙂 Thanks. I am seriously trying to find any excuse to make them again……


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