🍫 Brownies in a Jar
The Perfect Shelf-Stable Treat for Work Lunches & Gifts
📌 In This Article
🍫 The Brownie in a Jar Story
"Replenishing hubby's 'brownie in a jar' for his work lunches. He was out & I had a brownie mix to use up so here they are. They are pinging away one by one. 😀 I'll whip up a homemade batch this week & get him a larger stock on the shelf. Water bath 5 minutes plus altitude." 🍫✨
Brownies in a jar are a game-changer for lunchboxes, snacks, and emergency dessert needs. They're shelf-stable, perfectly portioned, and always a hit. Whether you're using a boxed mix or making them from scratch, these jarred brownies are a convenient and delicious treat that your family will love.
This recipe shows you how to bake brownies directly in jars and then process them in a water bath for long-term storage. The result? A moist, fudgy brownie that's ready to eat whenever you are.
💬 The convenience factor: "They are pinging away one by one." – The sound of jars sealing is the sound of success!
🌟 Why Brownies in a Jar are Brilliant
- 🍫 Shelf-stable: No refrigeration needed – perfect for lunches
- 🎁 Great for gifting: Beautiful and thoughtful presents
- 🍽️ Perfect portions: Individual servings, no leftovers
- ⏱️ Convenient: Grab and go – ideal for busy mornings
- 🥫 Long shelf life: Lasts for months on the pantry shelf
📦 Ingredients
For 6-8 Jars (Using a Boxed Mix):
- 📦 1 box brownie mix – your favorite brand
- 🥚 Eggs, oil, and water – as called for on the box
For Homemade Brownie Mix:
- 🌾 1 cup all-purpose flour
- 🍬 1 cup granulated sugar
- 🍫 ½ cup unsweetened cocoa powder
- 🧂 ½ teaspoon salt
- 💨 ¼ teaspoon baking powder
- 🫒 ½ cup vegetable oil
- 🥚 2 large eggs
- 💧 ¼ cup water
- 🌿 1 teaspoon vanilla extract
💡 Pro tip: "Using a boxed mix is quick and easy, but homemade brownies from scratch are even more delicious and impressive."
📝 Step-by-Step Instructions
Step 1 – Prepare the Brownie Batter
- Using a boxed mix: Follow the package instructions to prepare the batter.
- From scratch: In a bowl, combine flour, sugar, cocoa, salt, and baking powder. Add oil, eggs, water, and vanilla. Mix until smooth.
💡 Pro tip: "Don't overmix the batter – it will make the brownies tough."
Step 2 – Prepare Jars
- Wash and dry wide-mouth half-pint jars.
- Grease the inside of each jar with butter or cooking spray.
Step 3 – Fill Jars
- Fill each jar about halfway with brownie batter.
- The brownies need room to rise.
- Do not fill more than halfway.
💡 Pro tip: "Fill only halfway – the brownies will rise and expand during baking."
Step 4 – Bake
- Preheat oven to 350°F (175°C).
- Place jars on a baking sheet.
- Bake for 25-30 minutes, or until a toothpick comes out clean.
Step 5 – Add Lids and Process
- Remove jars from the oven.
- Wipe rims clean.
- Apply lids and bands – fingertip-tight.
- Place jars in a boiling water bath.
- Process for 5 minutes (adjust for altitude).
⚠️ Important: "Water bath 5 minutes plus altitude." – The sealing process is what makes these brownies shelf-stable.
Step 6 – Cool and Check Seals
- Remove jars from the water bath.
- Cool for 12-24 hours.
- Check seals – lids should not flex when pressed.
🥫 Canning Guide
Why Water Bath Canning Works:
- 🔥 The baking process creates a vacuum seal.
- ✅ The 5-minute water bath ensures a proper seal.
Altitude Adjustments:
- 0 – 1,000 ft: 5 minutes
- 1,001 – 3,000 ft: 10 minutes
- 3,001 – 6,000 ft: 15 minutes
- Above 6,000 ft: 20 minutes
🍽️ Serving Ideas
- 🍫 Straight from the jar: The ultimate convenience
- 🍦 With ice cream: Warm the brownie and top with vanilla ice cream
- 🎁 Gift giving: Beautiful jars make thoughtful presents
- 🧺 Picnics: No mess, no cleanup
- 🏕️ Camping: A sweet treat in the great outdoors
❓ Frequently Asked Questions
❓ Can I use any jar?
Use wide-mouth half-pint jars for easy filling and serving.
❓ Why do I need to process them in a water bath?
The water bath creates a vacuum seal, making the brownies shelf-stable.
❓ How long do they last?
Properly sealed jars last up to 18 months on the shelf.
❓ Can I use a different brownie mix?
Yes – any brand or homemade recipe works.
❓ Why are my brownies dry?
Overbaked – check at 25 minutes.
❓ Can I add mix-ins?
Yes – add chocolate chips, nuts, or peanut butter chips.
❓ What if my jars didn't seal?
Refrigerate and use within 2 weeks.
❓ Can I freeze these?
Yes – but they're already shelf-stable!
❓ Can I use this method for other treats?
Yes – try it with banana bread or pumpkin bread.
❓ How do I reheat them?
Warm in the microwave or a toaster oven.
📄 Printable Recipe Card
╔═══════════════════════════════════════════════════════════════════════╗
║ BROWNIES IN A JAR ║
║ The Perfect Shelf-Stable Treat for Work Lunches ║
╚═══════════════════════════════════════════════════════════════════════╝
YIELD: 6-8 jars | TIME: 1.5 hours
BOXED MIX METHOD:
- 1 box brownie mix
- Eggs, oil, water as directed
HOMEMADE METHOD:
- 1 cup all-purpose flour
- 1 cup sugar
- ½ cup cocoa powder
- ½ tsp salt
- ¼ tsp baking powder
- ½ cup oil
- 2 eggs
- ¼ cup water
- 1 tsp vanilla
INSTRUCTIONS:
1. Prepare brownie batter.
2. Fill half-pint jars halfway with batter.
3. Bake at 350°F for 25-30 minutes.
4. Wipe rims, apply lids.
5. Process 5 minutes in water bath (adjust for altitude).
6. Cool 12-24 hours. Check seals.
STORAGE: 18 months (cool, dark place).
"Replenishing hubby's brownie in a jar for his work lunches." 🍫
© CanningRebels — Brownies in a Jar | The Perfect Shelf-Stable Treat
.png)
Comments