Half-Baked: Peanut Butter Marshmallow Squares

Bryan Mailloux - 3A Mechatronics
Posted on: March 11, 2017

Hello again from the Half-Baked kitchen! It’s been pretty hectic over the past little while (we’re starting to get into that system transient analysis – we’re not in steady-state land anymore) and I haven’t had time to try any entrée recipes for this issue. So, I’m just going to feature some really easy-to-make Peanut Butter Marshmallow Squares. These take only about 15 minutes to prepare and take about an hour to set – perfect for busy folks like us – and are great as a morning snack if would rather sleep in and forgo eating breakfast.

Peanut Butter Marshmallow Squares – makes 24-ish squares


  • 1/2 cup margarine
  • 3/4 cup peanut butter (either crunchy or smooth peanut butter works, but I’d recommend smooth peanut butter)
  • 1 package of either butterscotch or semi-sweet chocolate pieces (butterscotch is my personal favourite)
  • 3 cups of mini marshmallows
  • You’ll want a casserole dish on hand too


Start by melting the margarine, the peanut butter and the butterscotch or chocolate in a pot. While those ingredients are melting, melt some more margarine in a bowl by microwaving it for a minute. When the margarine is melted, use it to grease the casserole dish. (I’ve tried greasing a pan using non-stick spray before – sure, it’s easier, but then whatever you put in the pan tastes a bit like non-stick which isn’t very tasty.) By now, the ingredients in the pot should be melted, so mix them together. Once they’re well mixed, take the pot off the heat and wait for the mixture to cool down to about a lukewarm temperature. (Testing the temperature of the mix is a good excuse to eat some of it too…) Finally, when the mixture has cooled down enough, add in the marshmallows and stir well. Put the mix in the greased pan and put it in the fridge to harden the squares. If you want it to harden faster, you can put it in the freezer, but keep an eye on it because you don’t want it to freeze solid. And after about an hour, your peanut butter marshmallow squares will be ready to enjoy!

The good thing about this recipe is that you have to get mini marshmallows, and since you won’t be using all the marshmallows to make the marshmallow squares, you can just eat them while you make the squares. Or whenever you want, really. Mini marshmallows are great to have as a snack while studying. Just get a club-sized bag full and reward yourself with a mini marshmallow or twenty after you finish a homework question. I’d limit eating the marshmallow squares to one per assignment though. Unless you’re doing transient analysis questions. Then since one question is going to take you two hours anyway, you may as well have one square per question. Marshmallow squares also have the extra benefit of cheering you up after you answer a question wrong. Or any time, really. They’re the true key to happiness.

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