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A big plate of Seasonal Coloured Autumn Monster Cookies | BakeThenEat.com
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5 from 2 votes

Seasonal Coloured Autumn Monster Cookies

Seasonal Coloured Autumn Monster Cookies are a seasonal take on the classic oatmeal peanut butter cookie.
Prep Time10 mins
Cook Time15 mins
Total Time25 mins
Course: cookies
Cuisine: American
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.  


Serving: 1Cookie | Calories: 333kcal | Carbohydrates: 35.8g | Protein: 6.8g | Fat: 19.5g | Saturated Fat: 9.1g | Cholesterol: 46mg | Sodium: 258mg | Fiber: 1.7g | Sugar: 24.3g