100 Day of Science #39-- Making Solar S'mores

For three or so summers now I have been wanting to make a solar oven using a pizza box.  I knew my boys would enjoy the yummy s'mores treats we could make inside and it would be a fun science lesson about solar heat too but somehow we've just never gotten around to it.

We had takeout pizza over the weekend and one of our boxes was pretty clean so I nabbed it and tucked it away waiting for a nice hot, sunny day.  After 4 or 5 days of rain we finally had sun in the forecast so we dragged out all our supplies and got to work.

First we used a ruler and an X-Acto knife to cut a flap out of the top of the pizza box.

Then we lined the inside bottom of the box with black paper taping the papers down in a few places as needed. Black paper helps absorb the sunlight.

We wrapped foil around the flap we had just cut out to help reflect any sunlight back into the center of our oven.  We held the foil in place with tape where needed.

Then we lined our opening with clear seran wrap; taping up all 4 sides to trap in the heat and keep any bugs from finding their way in.

Our oven is all ready for us to put our food inside!

We put graham crackers down and topped them with some Hershey's chocolate and a marshmallow.

Then we set our oven out in the sunlight and ended up using our ruler to prop open our reflector panel.

Within just 30 minutes we could see the chocolate melting.

Since it was only 80 out we did keep our s'mores out in the sun for 2 hours.  While our oven was quite warm and was great at trapping the heat inside it takes a whole lot of heat to melt marshmallows.

We brought them inside and dug in.  They were delicious!  Two of my boys liked this method better than toasting them over a fire.

I loved that we could even see where the crackers had been and just how quickly the sunlight faded our black paper.  

This was such a fun and yummy experiment on solar power!  

It really had been so simple to set up too that I had to question why it took us so long to try it.  

Have you ever made a solar oven?

Others in this series:
2.  Field Trip to the Ecotarium 
3.  Learning About Air Molecules
38. Making Fresh Peach Preserves 

Linking Up With:

Oh My Heartsie Girls WW 650 x 635

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Can You Stop Growing Now!?

WW 9 Hostesses Collage May 2018


  1. Wow these look really fun and creative - I guess you need a bright day to ensure they 'cook' :-)

  2. Such a great idea! I bet that will work really well in hot AZ! I will have to remember this one. Thanks for sharing. :)

    1. This would work great! Our day wasn't all that hot and it took quite some time for the marshmallow to soften.

  3. What a fun AND delicious science lesson! My son would definitely love this one. Thanks so much for sharing with us at the Whimsical Wednesdays Link Party. :-D

    1. My boys to tend love any lessons that are edible.


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