A peanut butter filled cupcakes in a jar is amazing!! Like a copycat Wicked Good cupcakes recipe, they are ooey and gooey topped with chocolate gelato. A little jar full of heaven I tell you. How to Bake Cake in a Jar is fun and will be the talk of your party.

My girls and I love baking and I definitely passed along my love for desserts to them. We thought we’d make something super fun today and they were amazing! Can you taste them already? It’s kinda’ like our s’mores in a jar we created earlier on except we added a spoonful of peanut butter this time!! Totally ooey and gooey inside topped with ice cream on top, they’re Heaven I tell you.
Yes you could make the base homemade but we just made it as a boxed cake mix recipe. Then bake in the oven, add ice cream on top and enjoy while they’re still warm.
If you have only made cupcakes in a muffin pan you MUST try them this way! I love easy. Instead of adding in the list of ingredients on the side of the cake box, I just added a can of soda to the mix!! Believe me, they turn out amazing.
Small mason jars are a fun container to use too. Besides cute, they are reusable. We love that. You don’t need to fill them with peanut butter but oh my goodness it is so wonderful if you do. You could substitute hot fudge instead, either way you can’t go wrong.
There are a variety of flavors you can use for the cake portion, but I wanted chocolate!! Seriously the best one of our box cake mix hacks we have ever ever made. I added chocolate chips into the batter, AND I topped them off with a rich scoop of this chocolate gelato to make it go from delicious to just out of this world!
Before our only other smaller option for treats was this recipe for 6 cupcakes. Now these work great as an after dinner YUM too. They are the perfect size for everybody. With a scoop of gelato on top seeping inside the cupcake = yum!
Ingredient Notes
- Mini mason jars like these are the ones we used. You want to clean well beforehand and check to make sure they don’t have any damage to them.
- Chocolate cake mix or any flavor really will do but this is our favorite.
- 1 can of soda – we used Coca Cola to deepen the cocoa flavor for this combination
Optional Add Ins
Chocolate chips are optional to fold into the batter + peanut butter to stuff middle – we used creamy. If you want to add a scoop of ice cream I would do so immediately and serve right away so it melts a bit.
Tips for baking in mason jars
There is information online in regards to baking in glass jars. In it it states that it is not always safe and may cause the jars to crack if they already have a hairline crack so you should inspect each one before filling. I have never experienced this but you should do this at your own risk.
Cupcake in a Jar Recipe
Equipment
- 1 baking sheet
- 12 small mason jars
- 1 Bowl
Ingredients
- 1 box chocolate cake mix
- 1 can soda, (dark soda is best, or use ingredients on cake mix to make batter)
- 1/2 cup chocolate chips, optional – but delicious
Instructions
- Mix together well your box of cake mix and can of soda. Mix until there are no lumps remaining.
- Fold in your chocolate chips.
- Spray lightly the inside of small mason jars (4 oz size) and put 1/2 c. of batter (don’t fill more than 1/2 way full since they will rise) in each one. Put all on a cookie sheet and put in the oven.
- Bake in the oven for 27 minutes or so at a preheated 350 degrees or until cupcakes spring back when touched gently in the middle…do NOT over bake.
- When slightly cooled you can use a small spoon or apple corer and make a hole in the center of your cupcakes to spoon in a small spoonful of peanut butter into the center of each one.
- Scoop chocolate gelato on to each one and add a bit of sprinkles if you wish. Enjoy!!
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
Looking for other easy desserts? Try making a few air fryer cupcakes sometime. The kids got a kick out of our other soda cupcakes dessert too. So easy to do with just 2 ingredients and low in fat too.
Just don’t count the calories y’all, just enjoy. If you’re making these for people coming over, pairing them with this wine gift idea is great too!
I wrote this post WAY before Wicked Good Cupcakes in a Jar was created. Now I’m thinking I should’ve trademarked the idea. lol. BUT you can make them yourselves at home this way.
This will be fun for the grands.
Really like that gelato combo with the peanut butter. Going to try to make it great idea!
Elaine