🍰 45 Mini Cakes in a Jar
Perfectly Sealed for Hubby's Lunch!
📌 In This Article
🍰 The Lunchbox Story
"45 cans of mini cakes in a jar perfectly sealed for the hubby’s lunch"
If you pack lunches for work or school, you know the struggle of finding snacks that travel well, don't get crushed, and stay fresh. That's why these Mini Cakes in a Jar are a total game-changer.
I just made a massive batch of 45 jars, and every single one sealed perfectly. Now, my husband has a shelf-stable, homemade dessert ready to toss into his lunchbox whenever he wants one.
They are moist, delicious, and perfectly portioned. Whether you use a classic vanilla cake or chocolate, they are guaranteed to bring a smile to anyone's lunch break.
💬 The verdict: "Perfectly sealed for the hubby's lunch." — A little jar of love in every lunchbox.
💪 Why Make Cake in a Jar?
Grab & Go Dessert!
🎒"Perfect for the hubby's lunch."
Travels Well
No crushing in a bag
Portion Control
Just the right size
Shelf Stable
Ready when you are
Bake once, enjoy for months.
📦 Ingredients
This recipe uses a standard boxed cake mix for convenience, but you can use your favorite scratch recipe, too!
🍰 For the Cake
- 🎂 1 box of cake mix – (plus the eggs, oil, and water it calls for)
- 💨 Non-stick spray
- 🍫 Optional: Chocolate chips, sprinkles, or nuts
🫙 For the Jars
- 🫙 Wide-mouth half-pint jars (8 oz)
- 🧴 New lids and rings
💡 Pro tip: "Wide-mouth jars are essential so you can easily scoop the cake out with a spoon!"
📝 Step-by-Step Instructions
Step 1 – Prep the Jars
- Preheat your oven according to the cake mix instructions.
- Spray the inside of your jars generously with non-stick spray.
- Wipe the rims clean to ensure there's no spray residue on the glass threads.
Step 2 – Make the Batter
- Prepare the cake batter according to the package directions (or your recipe).
- If using mix-ins, gently fold them into the batter.
Step 3 – Fill and Bake
- Fill the jars about halfway full with batter. (Don't overfill! The cake needs room to rise).
- Place the jars on a baking sheet (for stability).
- Bake at the temperature on the box, but start checking them early. They usually take about 20-25 minutes, or until a toothpick inserted in the center comes out clean.
⚠️ Important: "Do not put cold jars into a hot oven. Let the jars come to room temperature first to prevent thermal shock and breakage."
Step 4 – Pressure Can (The Rebel Way)
- As soon as the jars come out of the oven, place hot lids and bands onto the jars.
- Place the sealed jars into a pressure canner with 2-3 inches of water.
- Process at 10 lbs pressure for 40 minutes.
- Allow the pressure to naturally release.
- Remove the jars and let them cool completely on the counter.
⚠️ Important Safety Warning
This is a rebel canning recipe. While baking in jars and sealing with the residual heat is a traditional method, using a pressure canner guarantees a strong vacuum seal for long-term storage. Always use your best judgment.
Step 5 – Store
- Check the seals (the center should not pop up and down).
- Wipe down the jars to remove any water spots.
- Store in a cool, dark place for up to a year.
❓ Frequently Asked Questions
❓ Can I frost the cake before putting it in the jar?
No, frosting will spoil on the shelf. Store the cake plain in the jar and add frosting when you're ready to serve.
❓ Why did my cake overflow?
You filled the jars too full. Only fill them halfway to leave room for rising.
❓ Are these safe for shelf storage?
Yes, when processed in a pressure canner, the heat destroys any mold spores and creates a strong seal, making them shelf-stable.
❓ Can I use a water bath instead?
Some people do, but a pressure canner is safer and ensures a better seal for baked goods containing dairy and eggs.
📄 Printable Recipe Card
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║ MINI CAKES IN A JAR ║
║ Perfect for Hubby's Lunch! ║
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YIELD: 45 half-pint jars | BAKE: 20-25 mins | PROCESS: 40 mins
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INGREDIENTS
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- 1 box cake mix (plus ingredients called for)
- Non-stick spray
- Optional mix-ins (chocolate chips, etc.)
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INSTRUCTIONS
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1. Preheat oven. Spray jars with non-stick spray.
Wipe rims clean.
2. Prepare cake batter.
3. Fill jars halfway. Place on a baking sheet.
4. Bake 20-25 mins until a toothpick comes out clean.
5. Immediately place hot lids and bands on the jars.
6. PRESSURE CAN:
- Half-pints: 40 minutes at 10 lbs pressure
7. Cool, check seals, and store.
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"Perfectly sealed for the hubby's lunch." 🍰🎒
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© CanningRebels — Mini Cakes in a Jar
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