Mad Scientist Cookies

October 16, 2017


Scrumptious cookie bars filled with marshmallows, oreos and mms.  The perfect mishmash of sweets for a special treat.


These "Mad Scientist" cookies were such a hit a few weeks ago when my son Colin and I made them. The idea behind them was all him.  We were having a new front door put in, the heavy duty all iron type and it was nonstop noise for hours so I thought a fun distraction would be a good idea.  


*updated 5/13/19.  We now make them as cookie bars, which is better for the marshmallows!



It pretty much went like this:

Me:  Colin do you want to go make cookies?  (as if there was any answer but yes)

Colin:  yes! cookies! (followed by a rambling of all the flavors he wanted)

Me:  What do you want to put in them?

Colin: m&m's!  marshmallows!  chocolate!  cake!  sprinkles!


So we scoured the pantry for supplies.  I had a lot of treats from the previous week, my girlfriends came over and we made caramel apples and watched (talked throughout) Hocus Pocus.  



Colin picked out m&m's, mini marshmallows and oreos.  I wasn't really sure this was going to be the best idea, but he's almost 4 and I knew he'd enjoy us following out his creative plan.  I had a couple thoughts while mixing all the candy, first was that when it bakes it could be a big flat blob of goop, second that they would completely stick (story of my life), or third I'm not a baker I have no clue what I am doing.  



I have to tell you...these were awesome!  They were chewy and delicious and with each bite you got a little taste of each ingredient.  I kept the oreos pretty chunky, I suggest this.  


The batch was gone by the next day, I gave half away and my family ate the other half.  I'm pretty sure I went to boxing that night, working hard for all my cookie eating sins.



Do you LOVE cookies?  Check out some of my favorites!

S'mores Cookie Bars

Cinnamon & Ginger Whoopie Pies

Coffee Cake Bars


1 stick butter (8 tbsp)

1/3 c white sugar

1/3 c brown sugar

3/4 tsp vanilla

1 egg

1 1/3 c flour

1/2 tsp salt

1/2 tsp baking soda

1/2 c mini marshmallows

4 oreo cookies, chopped coarsely  

1/4 c mini m&ms



Preheat oven to 375.


Cream butter and sugar in the bowl of a stand mixer on medium unit light and fluffy.  Scrape the sides of the bowl.  Add in the egg and vanilla, mix until combined.  In a separate bowl combine the dry ingredients.  Add these to your sugar mixture, along with the marshmallows, m&ms and oreos.  Mix on low just until incorporated.


Line a square baking pan with parchment paper and fill with the cookie dough, using your hands to spread it to the edges.  Bake for 20 minutes.  Cut into squares and serve!


 Enjoy --




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Welcome to

Modern Crumb!

Thanks for stopping by.  I'm Tara.  Food fan, avid crafter and pizza lover extraordinaire.  I'm a wife and a mom of two kids.  

Modern Crumb is a food blog that shares delicious and easy family friendly recipes that everyone wants to eat!





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