Mason Jar cookies with candy glass

Mason Jar Cookies with Candy Glass

Below you’ll find the steps to making Mason Jar cookies with candy glass, along with links to the products you might need!

How do you make mason jar sugar cookies that you can see through? 

This was the question that I couldn’t stop asking myself as I stared at the mason jar cookie cutter sitting on my counter top.

Suddenly, I remembered the candy glass we used to make for our gingerbread houses as kids. We would crush up hard candies, and bake them inside the window openings. They looked like beautiful stained glass windows you would see in a church. 

Except for this project, I wanted the “glass” on my mason jar cookies to be completely see through and colorless. Crushed hard candies and granulated sugar melt down to be yellowed and hazy; and that wasn’t going to work for me. I decided to try isomalt, a beet sugar that has a glass-like finish once melted down and hardened.

There was a lot of trial and error that I encountered between then and now, but I finally got it right!

Before I share with you how I made my Mason Jar decorated cookies with candy glass, I’ll lend you a word of caution when working with isomalt-

Isomalt gets hot! REALLY HOT! This isn’t one of those warnings you see on the side of your coffee cup, where it might be hot but you’ll sip it anyways and find out– this stuff will burn and stick to your skin at the same time. You’ll see in the video above how it sizzles from just a few minutes in the microwave. This is not a project for your children, or at least not without very strict adult supervision. I think you get my point. Now that the disclaimer is out of the way, lets get started!

Here’s some key things you’ll need: 

1 batch of sugar cookie dough (recipe HERE)

Mason jar cookie cutter (Buy HERE)

Rectangle cookie cutter (Buy HERE)

Isomalt (Buy HERE)

Royal Icing Mix (Buy HERE)

Parchment paper (for baking your cookies)

Aluminum foil (for the isomalt)

A heat safe glass container (one that can handle boiling temperatures)

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How to cut out and bake the mason jar cookies:

Step 1:

Roll out your cookie dough on a parchment sheet cut to the size of your cookie pan. You’re not going to move your cookies once they are cut, so cut them strategically so that you can fit the most on a sheet. Leave enough room so that they don’t spread into each other. If you’re using our sugar cookie recipe you’ll have minimal spreading.


Step 2:

Remove the excess dough from around each of your cut out cookies. Use your rectangle cookie cutter to cut out an opening right in the middle of each mason jar. Remove the cut out rectangle and add it back to your dough pile. 

sugar cookie dough mason jar with rectangle cookie cutter to cut out center

Step 3:

Lift the parchment sheet right onto your cookie pan and bake at 350 for 6-7 minutes, depending on the thickness of the cookie.  Remove from the oven and let cool completely on a cooling rack.


How to make candy glass:

Step 1:

Line a cookie pan with aluminum foil. Make sure it’s as smooth as possible (no wrinkles!) and line up all your cooled mason jar cookies onto the pan.


Step 2:

Pour a 1/2 cup of isomalt in a heat safe glass dish or measuring cup, and microwave for 2 minutes. After the 2 minutes, carefully remove from the microwave and stir well. It will only be partially melted at this point.

isomalt in a measuring cup

melting isomalt in a glass measuring cup

1/2 cup Isomalt after being melted in the microwave for 2 minutes

Step 3: 

Microwave for 1 minute (at this point it’s probably sizzling) and stir again. Use the hot isomalt to wash everything off the sides of the container. At this point it should be fully melted down without any white specks. If you still have some unmelted isomalt, place your container back into the microwave for 30 seconds. Be careful not to burn the isomalt (it will turn yellow). 



Step 4:

Wait a few seconds for the bubbles in the isomalt to come to the surface. Do a small test pour onto the side of your aluminum foil. Pouring from higher up will allow any air bubbles to pop as they come down. If your test pour has a lot of air bubbles wait another second or two before pouring into your cookie.

(Note: the hotter your isomalt, the thinner it will pour and spread out. You’ll be able to pour 3-6 cookies before you have to heat it up again. Just microwave for 30 seconds at a time until it becomes fluid again)

Slowly pour the isomalt into the center of the rectangle opening, and let the hot sugar flow out to the edges. Wiggle your cookie a little if it doesn’t quite go to the edges.

pouring isomalt into the center of the mason jar cookie to make candy glass

Step 5:

Let it harden for 5-10 minutes and then peel the mason jar cookies off the aluminum foil. You now have mason jar cookies with candy glass! Isomalt holds heat, so let them cool down completely before decorating with royal icing.

mason jar cookies with see through candy glass on a cookie sheet

Your Mason Jar cookies with candy glass are ready to decorate!

I decorated my cookies with royal icing tinted with a very tiny drop of AmeriColor Teal Gel Paste Food Color. For the lid, I added a tiny drop of AmeriColor Super Black Gel Paste Food Color to my royal icing to make it gray.

Once your royal icing is fully hardened on your cookies (after a few hours) you can flip them over and adhere sprinkles or any flat icing decorations using corn syrup as “glue”. mason jar cookies with candy glass made from isomalt. Decorated with bright colored heart sprinkles

Like anything, making these mason jar cookies with candy glass will take practice. If you have any questions, leave a comment below!

Mason-Jar-decorated-cookie-with-see-through-candy-glassSee-through-mason-jar-cookies-with-candy-glassMason jar cookies with see through candy glass decorated with royal icing and brightly colored heart sprinkles

Mason Jar Cookies with Candy Glass

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4 Thoughts on “Mason Jar cookies with candy glass

  1. Nancy Weisbart on March 6, 2017 at 9:34 pm said:

    How does the isomalt taste?

    • confectionery on March 7, 2017 at 4:10 pm said:

      Isomalt is mildly sweet, it’s not as sweet as granulated sugar. You can flavor the isomalt with a LorAnn flavoring oil but be aware that if the flavoring has a tint to it, it might color your isomalt slightly.

  2. Ellen on June 8, 2017 at 8:42 pm said:

    What a fun idea! I definitely want to try these. Before I do, I can’t help but think about the clean up after. How do you clean the glass measurement cup after making the cookies?

    • confectionery on June 13, 2017 at 11:16 am said:

      Hi Ellen!

      It was actually quite easy to clean up after this project! We just ran the glass measuring cup under hot water and the isomalt dissolved away!

      Glad you loved the tutorial!


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