Table of Contents
Here is a short video explaining the process, scroll down for detailed ingredients and step by step recipe method. Thanks for coming and do not forget to check other recipes on our homepage.
Ingredients With Exact Amount
For the Cake
- 1 box vanilla or white cake mix, 15.25 ounces
- 1 box instant vanilla pudding mix, 3.4 ounces
- 1 cup buttermilk, room temperature
- Half a cup unsalted butter, melted
- 4 large eggs, room temperature
- 1 teaspoon vanilla extract
For the Whipped Buttercream Frosting
- 1 cup unsalted butter, softened
- 4 cups powdered sugar
- 3 to 4 tablespoons heavy cream or milk
- 1 teaspoon vanilla extract
- A pinch of salt
Why the Extra Ingredients Make a Difference
The secret to getting that bakery style texture lies entirely in these small additions to the basic box mix. The instant pudding adds extra moisture and a denser, richer crumb, while swapping the oil and water called for on the box with melted butter and buttermilk gives the cake far more flavor and softness. Adding an extra egg beyond what the box recipe calls for also helps bind everything together, giving you a cake that holds its shape while still staying incredibly tender.
Step by Step Recipe Method
Prepare Your Pans and Oven
Preheat your oven to 325 degrees Fahrenheit, which is slightly lower than what most box mixes call for, since baking at a gentler temperature helps the cake rise evenly without drying out the edges. Grease two 9 inch round cake pans or one 9 by 13 inch pan with butter or baking spray, then line the bottoms with parchment paper to make sure your cake releases cleanly once baked.
Mix the Cake Batter
In a large mixing bowl, combine the cake mix and instant pudding mix, whisking them together until evenly blended. Add the buttermilk, melted butter, eggs, and vanilla extract, then beat everything together with an electric mixer on medium speed for about two minutes. The batter should look smooth, thick, and slightly glossy once fully combined, with no dry streaks of cake mix remaining.
Pour and Bake
Divide the batter evenly between your prepared pans, using a spatula to smooth the tops so the cake bakes evenly. Bake for 28 to 32 minutes for round pans, or 35 to 40 minutes if using a single 9 by 13 inch pan, checking doneness by inserting a toothpick into the center. The cake is ready when the toothpick comes out clean or with just a few moist crumbs attached, and the top springs back gently when touched.
Cool the Cake Completely
Let the cakes cool in their pans for about ten minutes before running a knife around the edges and turning them out onto a wire rack. It’s important to let the cakes cool completely before frosting them, since warm cake will cause the buttercream to melt and slide right off. This cooling process usually takes about an hour, so plan ahead if you’re baking and frosting on the same day.
Make the Whipped Buttercream
While the cake cools, beat the softened butter in a large bowl on medium speed for about three minutes until it turns pale and fluffy. Gradually add the powdered sugar one cup at a time, beating well after each addition, then pour in the heavy cream, vanilla extract, and a pinch of salt. Continue beating on medium-high speed for another two to three minutes until the frosting looks light, airy, and spreadable, similar to the whipped texture you’d find on a Walmart bakery cake.
Assemble and Frost the Cake
Place one cake layer on your serving plate or cake stand, then spread a generous layer of buttercream evenly over the top using an offset spatula. Add the second cake layer on top, then frost the entire outside of the cake with the remaining buttercream, smoothing it out as you go. If you’d like a smooth, bakery style finish, dip your spatula in warm water between strokes to help glide the frosting evenly across the surface.
Variations in the Recipe
Turning It Into Chocolate Cake
To make a chocolate version of this copycat cake, simply swap the vanilla cake mix and pudding for chocolate cake mix and chocolate instant pudding. The rest of the ingredients and steps stay exactly the same, giving you that same moist, dense texture but with a rich chocolate flavor throughout. This variation pairs wonderfully with the same vanilla buttercream, or you can make a chocolate buttercream by adding cocoa powder to the frosting recipe.
Adding Sprinkles for a Funfetti Version
If you want a fun, colorful cake perfect for birthdays, fold in three quarters of a cup of rainbow sprinkles into the batter right before pouring it into the pans. Be sure to use the classic rod shaped sprinkles rather than the tiny round nonpareils, since those tend to bleed their color into the batter and turn it a muddy gray. This small addition instantly makes the cake feel more festive and celebratory.
Making Cupcakes Instead
This same batter works beautifully for cupcakes if you’re looking for individual portions instead of a full layer cake. Line a muffin tin with paper liners, fill each about two thirds full with batter, and bake at 325 degrees Fahrenheit for 18 to 20 minutes, checking for doneness with a toothpick. This recipe yields about 24 standard sized cupcakes, perfect for parties or bake sales.
A Lighter Frosting Option
If you find traditional buttercream too rich or sweet, you can swap it out for a whipped cream cheese frosting instead, which brings a slight tang that balances out the sweetness of the cake. Simply beat together 8 ounces of softened cream cheese with the same butter and powdered sugar measurements above, adjusting the cream as needed to reach your desired consistency.
Mistakes to Avoid
Overbaking the Cake Layers
One of the easiest ways to end up with a dry cake is leaving it in the oven a few minutes too long. Since this recipe already includes extra moisture from the buttermilk and pudding, it’s especially important to start checking for doneness a few minutes before the recommended bake time, pulling the cake out as soon as the toothpick comes out clean.
Frosting a Warm Cake
Trying to frost your cake before it has fully cooled is a mistake that can ruin all your hard work in an instant. Warm cake causes the buttercream to melt and slide, leaving you with a messy, uneven finish instead of that smooth bakery look. Always give your cake layers a full hour to cool completely on a wire rack before frosting.
Skipping the Room Temperature Ingredients
Using cold eggs and buttermilk straight from the fridge can cause your batter to mix unevenly, sometimes resulting in a slightly dense or lumpy texture. Let your eggs and buttermilk sit out for about twenty to thirty minutes before baking so they blend smoothly into the batter, giving you that soft, uniform crumb this recipe is known for.
Overmixing the Batter
While it’s important to mix the batter until smooth, beating it for too long can incorporate too much air and overdevelop the structure, leading to a cake that sinks slightly in the middle after baking. Mix just until the ingredients are fully combined and the batter looks smooth, then stop, rather than continuing to beat it for several extra minutes.
Conclusion & FAQs Section
Recreating that soft, moist Walmart bakery style cake at home is a lot easier than most people expect, and once you try this doctored box mix method, you’ll probably never go back to baking a plain box cake again. With just a few extra pantry staples and a little patience while it cools, you’ll end up with a cake that tastes like it came straight from a professional bakery counter. Whether it’s for a birthday, a celebration, or just a weekend treat, this recipe is guaranteed to impress.
Can I use a different cake mix flavor?
Absolutely, this doctoring method works with almost any boxed cake mix flavor, including chocolate, red velvet, lemon, or funfetti. Just make sure to match the pudding flavor to complement the cake mix, since this combination is what creates that rich, moist texture throughout the finished cake.
How should I store this cake?
Store the frosted cake in an airtight container or under a cake dome at room temperature for up to three days, or in the refrigerator for up to five days if your kitchen tends to run warm. If refrigerating, let the cake sit out for about twenty minutes before serving so the buttercream can soften back to a spreadable, pleasant texture.
Can I make the cake layers ahead of time?
Yes, you can bake the cake layers up to two days in advance, wrapping them tightly in plastic wrap and storing them at room temperature until you’re ready to frost. You can also freeze the unfrosted layers for up to two months, thawing them completely at room temperature before assembling and frosting your cake.
Why does my frosting look grainy instead of smooth?
Grainy frosting usually happens when the powdered sugar isn’t fully incorporated or when the butter wasn’t soft enough to begin with. Make sure your butter is properly softened at room temperature before you start, and beat the frosting a little longer on medium-high speed to help everything come together into that smooth, whipped texture.