Homemade Chocolate Cake Mix in a Jar (Better Than the Box!)

Raise your hand if you’ve ever grabbed a boxed cake mix off the grocery shelf and felt a little twinge of guilt reading the ingredients list.

Hydrogenated oils. Artificial flavors. Ingredients you can’t even pronounce.

There’s a better way, and it’s sitting right in your pantry. With about ten minutes of work, you can put three jars of homemade chocolate cake mix on your shelf, ready to bake at a moment’s notice. And the best part? This cake is more moist and decadent than anything that ever came out of a cardboard box.

Just being real, once you taste this cake, the boxed stuff will lose its appeal completely.

Here’s how to make it.

Why Make Cake Mix in a Jar?

A few good reasons this belongs in your pantry rotation:

You control every ingredient. No mystery additives, no shelf-stabilizing chemicals, just real food.

It’s frugal. Buying flour, sugar, and cocoa in bulk and assembling your own mixes costs significantly less per cake than the boxed versions.

It’s ready when you need it. Last-minute potluck? Surprise birthday? Just dump, mix, and bake.

One jar equals one cake. Each quart jar holds enough mix for one full cake. Make three at a time and you’ve stocked your shelf with the equivalent of three boxes from the store.

Ingredients for One Quart Jar

Here’s everything that goes into one jar of chocolate cake mix:

• 1 1/2 cups sugar
• 1 3/4 cups flour
• 1 teaspoon salt
• 1 teaspoon ground coffee (instant works too)
• 1 teaspoon baking soda
• 1/2 teaspoon baking powder (Rumford is aluminum-free)
• 1/4 cup buttermilk powder
• 1/2 cup cocoa powder

A quick note on a few of those ingredients:

The coffee might surprise you. You won’t taste it, I promise. What it does is deepen and enhance the chocolate flavor in a way that’s hard to describe until you taste it. The darker the roast, the better. That said, with coffee prices being what they are right now, don’t run out and buy a special bag just for this. Whatever you have on hand will work just fine.

Buttermilk powder is the ingredient that takes this from “pretty good” to “where have you been all my life.” It’s not a standard pantry item for most folks, but you can find it on Amazon (Anthony’s Goods and Hoosier Hill are both excellent). In a pinch, regular powdered milk will work, but the buttermilk powder is worth tracking down.

I love Redmond’s Real Salt because it’s unbleached and still has all its minerals, but any salt you have will do the job.

How to Assemble Your Jars

This part couldn’t be simpler. Grab a quart canning jar (widemouth is easier to work with) and start layering:

1. Sugar
2. Flour
3. Salt
4. Coffee
5. Baking soda
6. Baking powder
7. Buttermilk powder
8. Cocoa powder

Give the jar a shake or tap on the counter every few ingredients to settle everything down. Cap it with a lid and ring, label it with the contents and baking instructions, and you’re done.

A tip on storage: I buy baking soda in 10-pound bags and store the bulk in a sealed container, only bringing out a pint at a time for the fridge. The cost per ounce is a fraction of what you have to pay for those little yellow boxes.

What About the Chocolate Chips?

A proper chocolate cake needs chocolate chips, and this recipe calls for one cup. I chose to add them at baking time rather than in the jar because chocolate chips would push this recipe up to a half-gallon jar. Quart jars fit better on my pantry shelves, so I’d rather add them later.

If shelf space isn’t an issue for you, go ahead and add one cup of chocolate chips to the jar and size up.

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How to Bake the Cake

When you’re ready to bake, preheat your oven to 350°F and gather these wet ingredients:

• 1 cup chocolate chips (if not in the jar)
• 2 eggs
• 1 cup water
• 1 1/2 cups oil (I use coconut oil, but avocado oil works in a pinch)
• 2 heaping tablespoons sour cream

Instructions:

1. Dump the jar contents into a mixing bowl.
2. Add the chocolate chips, eggs, water, oil, and sour cream.
3. Mix until smooth.
4. Pour into your baking pan.
5. Bake at 350°F for 35 minutes, or until a toothpick inserted in the center comes out clean.

A note on pans: I rarely bake just for my family, so I don’t even own a traditional cake pan. I bake mine sheet-cake style in an 11×7 pan, which gives nice thick slices. A 9×13 will work but the cake will be thinner. A bundt pan would be beautiful too. Use what you have.

The Secret to a Moist, Decadent Cake

You’ll notice this recipe has a few ingredients you won’t find in a boxed mix:

Sour cream adds richness and moisture you can taste in every bite.

Buttermilk powder gives the cake a tender crumb and a slight tang that balances the sweetness.

Coffee deepens the chocolate flavor without tasting like coffee at all.

Together, these three ingredients are what make this cake worlds better than anything you’ll find in a box. It comes out so moist that frosting is optional. We’re not big frosting people around here, but if you like icing, this cake will hold up beautifully.

This is exactly the kind of intentional pantry building we love. A few minutes of prep now means real food convenience later, with no mystery ingredients and a fraction of the grocery store cost.

Make three jars while you’re at it. Make six. Tuck them on your shelf and pull one down whenever you need a cake. Your future self will thank you when company drops in unexpectedly or your kid announces at 8 p.m. that they need a treat for school tomorrow.