You want a fun, portable treat that feels like a party in a glass. These individual portions of moist chocolate cake are the perfect solution for your next celebration or sweet craving.
This recipe takes the classic combination of chocolate cake and buttercream and puts it into a convenient, single-serving format. By baking the cake directly in the jars, you eliminate the need for cutting slices or dealing with messy plates. It is a straightforward way to serve dessert that looks great and tastes even better.
Ingredient Notes
Chocolate cake mix: Use your favorite brand. Follow the specific instructions on the back of the box for the eggs, oil, and water needed.
Confectioners sugar: Ensure this is sifted if it looks lumpy so your frosting stays smooth and light.
Food coloring: Gel colors work best if you want vibrant, deep shades, but liquid drops are fine for pastels.
Birthday Cake in a Jar
Birthday Cake in a Jar
These portable chocolate cake jars feature layers of moist cake and colorful buttercream frosting. They are a fun and easy way to serve individual portions for any celebration.
Ingredients required by the cake mix box instructions
Buttercream Frosting
1 1/2cupsunsalted buttersoftened
16ouncesconfectioners sugar
2tablespoonsmilk
1teaspoonvanilla extract
Food coloring as desired
Instructions
Preheat your oven according to the cupcake temperature listed on your cake mix box and lightly coat the inside of 16 to 20 eight-ounce glass jars with non-stick cooking spray.
Prepare the cake batter in a large bowl by following the instructions provided on the cake mix box.
Pour the batter into the prepared jars, filling each one about halfway full, and wipe away any drips from the rims to ensure a clean finish.
Arrange the jars on baking sheets so they are not touching and bake for the time suggested for cupcakes on the box, adding about 5 minutes as needed until a toothpick inserted into the center comes out clean.
Allow the jars to cool completely on a wire rack before adding any frosting.
Prepare the frosting by beating the softened butter with an electric mixer until creamy, then gradually mix in the confectioners sugar, milk, and vanilla until the texture is light and fluffy.
Divide the frosting into two separate bowls and stir in your chosen food coloring until you reach the desired shades.
To assemble, either pipe frosting directly onto the cooled cake or scoop out a portion of the cake to create a hidden layer of frosting in the middle before topping with more frosting and sprinkles.
Keyword Birthday Cake in a Jar
Tima’s Tips
If you plan to seal the jars with lids, make sure the frosting level is low enough that it does not touch the lid when closed.
You can bake the cake jars a day in advance and store them at room temperature, but wait to add the frosting until you are ready to serve.
Variations
Add colorful sprinkles on top of the frosting for a classic birthday look.
Use a star-shaped piping tip to give the frosting a professional, decorative swirl.
Add a small dollop of fruit preserves or chocolate ganache in the center of the cake for an extra surprise.
Storage
Keep the frosted jars in a cool, dry place if serving within a few hours. For longer storage, keep them in the refrigerator, but let them come to room temperature before eating so the frosting softens up.
Common Questions I Get
Can I bake these in any type of glass jar?
Make sure you use heat-safe glass jars, such as standard mason jars, to ensure they do not crack in the oven.
Do I need to grease the jars?
Yes, lightly coating the inside of the jars with non-stick cooking spray helps the cake come out cleanly if you decide to scoop it out.
How far in advance can I make these?
You can bake the cake in the jars a day ahead of time, but it is best to frost them shortly before serving so the frosting stays fresh.
If you make this, let me know how it turned out in the comments below — I'd love to hear from you.
Tima
I’m Tima Miller, a self-taught cook and author of the Simple Yummy cookbook series. Every recipe here is tested, clearly written, and designed to work in a real home kitchen.
