Seasonal Coloured Autumn Monster Cookies

Posted on Oct 12, 2018

Monster Cookies have been around forever and a day. Most home bakers have their own version of these tasty oatmeal peanut butter cookies. I don’t know why I have taken so long to share mine, probably because there are so many recipes already online. But I was inspired by these lovely autumn coloured smarties (like M&Ms) that I saw in the shops. So I thought, why not pop them into monster cookies and share them with you guys.


A big plate of Seasonal Coloured Autumn Monster Cookies |

Monster cookies?

For those of you not in the know, monster cookies are basically a peanut butter oatmeal cookie. Some people use just old fashioned oats and some people exclusively use quick oats. I find having a combination of the two gives the best texture. They are also stuffed with M&Ms and chocolate chips, this time I packed them full of autumn inspired Smarties. I guess you could add raisins, or other inclusions if you wish to.

A big plate full of Seasonal Coloured Autumn Monster Cookies |


To help keep these cookies soft and chewy I used melted butter, as I find this really helps. And have taken to using melted butter in a lot of my cookies these days. As opposed to the creaming method.


Peanut Butter.

You can use smooth or crunchy peanut butter in these monster cookies. Personally used smooth as that is what I have in my cupboard, but I have used crunchy in the past. I used just regular good old fashioned peanut butter, not the type that you have to stir or the super drippy stuff. I’m not saying you can’t use this kind of peanut butter, I am just saying I have never tried these monster cookies with that type before. So I am not too sure what the results may be. As a side note, I did use no added sugar peanut butter, but that is just my preference.


Seasonal Autumn Monster Cookies |


Another great bonus of these cookies is they require no resting or chilling time. So it’s straight from the bowl to the oven and then straight onto my plate. They are so good when they are still a little warm as the chocolate is all melty! I’m just saying.



A big plate of Seasonal Coloured Autumn Monster Cookies |

Seasonal Coloured Autumn Monster Cookies

Seasonal Coloured Autumn Monster Cookies are a seasonal take on the classic oatmeal peanut butter cookie.
5 from 2 votes
Print Pin Rate
Course: cookies
Cuisine: American
Prep Time: 10 minutes
Cook Time: 15 minutes
Total Time: 25 minutes
Servings: 14 cookies
Calories: 333kcal
Author: Emma


  • 115 grams unsalted butter - melted (1 stick)
  • 100 grams of light brown sugar (1/2 cup)
  • 50 grams granulated sugar (1/4 cup)
  • 1/2 teaspoon salt
  • 200 grams peanut butter* (3/4 cup)
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • 125 grams plain/all purpose flour (1 cup)
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon baking powder
  • 1 teaspoon ground cinnamon
  • 40 grams quick oats* (1/2 cup)
  • 90 grams old fashioned oats (1 cup)
  • 180 grams smarties* (1 cup)
  • 100 grams dark chocolate chips (1/2 cup)


  • Preheat your oven to 180C/350F/Gas mark 4 and line a large baking sheet with baking parchment or a silicone baking mat.
  • Melt the butter in the microwave, then pour it into a medium sized mixing bowl.
  • Add both sugars, salt and peanut butter to the melted butter and mix it all together until everything is well combined. 
  • Then add the eggs and vanilla extract and mix well to incorporate everything together.
  • Gently fold in the flour, baking soda, baking powder and the ground cinnamon.
  • Then add in the quick oats and old-fashioned oats and fold in along with the smarties and chocolate chips.
  • I used a standard ice cream scoop to measure my cookies, but a 1/4 cup will also work well. Scoop the batter out and gently press down on the cookie dough just a little. As these cookies do not spread too much.  
  • Bake for 13 to 15 minutes. Be careful not to over bake these cookies as they are meant to be soft.
  • Place them on a wire rack to fully cool down. Keep them at room temperature in an airtight container and consume within 5 days. 


*You can use smooth or crunchy peanut butter in this recipe. I used standard peanut butter and not one of the natural ones that needed to be stirred.   
*Quick oats for those that don't know are just regular oats ground down a little bit. Don't go out an buy anything special if you don't have them in the cupboard. Just blitz up the required amount in a food processor for a few seconds. 
*I am not too sure if Smarties are a worldwide thing? If not, by all means, use M&Ms. They are not worlds apart and will work perfectly in this recipe. If you want an even bigger peanut butter punch then Recess Pieces would be a great substitute.  
Nutrition Facts
Seasonal Coloured Autumn Monster Cookies
Amount Per Serving (1 Cookie)
Calories 333 Calories from Fat 176
% Daily Value*
Total Fat 19.5g 30%
Saturated Fat 9.1g 46%
Cholesterol 46mg 15%
Sodium 258mg 11%
Total Carbohydrates 35.8g 12%
Dietary Fiber 1.7g 7%
Sugars 24.3g
Protein 6.8g 14%
* Percent Daily Values are based on a 2000 calorie diet.
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  1. I’ve not heard of monster cookies before, they sound great with the peanut butter and I love the autumn colours of these.

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  2. These are so cute, festive, and they look delicious! I don’t think it’s possible to ever go wrong with peanut butter! Smarties are a totally different thing here in the U.S. – they’re sugary pastel wafers with no chocolate at all. I believe you can get the chocolate Smarties in Canada too, though. I will definitely be taking your suggestion of using M&Ms or Reese’s Pieces…or both! 🙂

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    • Definitely no wafers in British smarties, so best to go with M&M’s. Thanks Brianan 😀

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  3. how festive! i know i’d love these cookies simply because they contain peanut butter. 🙂

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    • Thanks, Grace. Peanut Butter cookies are the best.

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  4. You can never go wrong with peanut butter in baked things! And it’s wonderful in cookies. These look wonderful — full of flavor. Monstrously good! 🙂 Thanks!

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    • Peanut Butter makes most things taste better, especially cookies.

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  5. Emma – I wonder if “monster cookies” are a UK kind of thing, because I haven’t heard of them. They do sound wonderful, though! And I love the colors!

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    • I’m not sure where monster cookies come from originally, but they sure are tasty 🙂

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  6. These really look fun! I don’t often bake cookies but I’ve started making them with my 4 year old grand daughter, and she’d love these!

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  7. It’s full on autumn here with the drop in temperatures, pumpkins and candy everywhere. Time to make a chewy delicious batch of monster cookies of course with a hot tea or coffee on the side. Just pinned!

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  8. I love oatmeal peanut butter cookies and these look so pretty with the warm autumn colours. Smarties is definitely here in South Africa…so I would love to give these a try too…such a beautiful ( and yummy )way to celebrate Autumn 🙂

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    • I’m so glad they have smarties in South Africa 😀

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  9. PB, M&Ms and chocolate chips…my my my…how could these cookies not good? I would probably end up eating more than i should 🙂 Have a wonderful weekend, Emma.

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