Moist Vanilla Pudding & Sour Cream Bundt Cake (Box Mix)

Doctored boxed cake mix transformed into a tender, homemade-tasting bundt cake with sour cream and instant vanilla pudding. This simple dessert is one of the easiest ways to elevate a store-bought mix — it bakes up moist, soft, and full of flavor every time.

Easy Cake Mix Bundt Cake with Pudding and Sour Cream

If you don’t consider yourself a baker, this recipe is perfect. It’s a semi-homemade approach that delivers the texture and flavor of a homemade cake with minimal effort. The extra ingredients — sour cream and instant pudding mix — turn a boxed cake into something richer, moister, and more flavorful. I make this by hand in one bowl with a spoon; no mixer required.

This doctored cake mix is a favorite for vanilla desserts and one of the best boxed mix hacks for consistently great results.

Ingredients

• 1 cup full-fat sour cream
• 3/4 cup vegetable oil
• 1/2 cup milk
• 4 eggs
• 1 box (15–16 oz / 432–461 g) yellow or vanilla cake mix, unprepared
• 1 box (4-serving) instant vanilla pudding mix, unprepared

These additions enrich the cake’s flavor and texture. Use your preferred brand of cake mix — Betty Crocker, Pillsbury, Duncan Hines, or another. Swap cake and pudding flavors to create variations.

Why sour cream and pudding improve cake mix

Adding the right amount of sour cream makes the cake richer and pleasantly denser without becoming heavy. Instant pudding mix boosts moisture and enhances the cake’s crumb, giving a fluffier, more tender result. Both ingredients together yield a cake that tastes homemade rather than boxed.

How to make the bundt cake

Preheat the oven to 325°F. Baking at 325°F rather than 350°F produces a softer, moister cake with a nicely golden crust that isn’t dark or dry.

Prepare a 10–12 cup (9–10 inch) bundt pan by greasing it thoroughly with oil or butter. Use your fingers or a pastry brush to coat all nooks, the tube, and the inner surface so the cake releases cleanly.

Make the batter: In a large bowl, whisk (or stir) together the sour cream, oil, and milk. Beat in the eggs, then add the cake mix and the instant pudding mix. Mix gently until just combined — the batter will be thick, which is expected.

Pour and bake: Transfer the batter to the prepared bundt pan and smooth the top. Bake for 40–45 minutes, or until a toothpick inserted deeply into the center comes out clean. For even baking, check the cake and test on the opposite side as needed.

Cool and remove: Let the cake cool in the pan about 20 minutes. Invert the pan onto a plate and tap gently if the cake doesn’t release immediately. Allow the cake to cool completely — about an hour or until no longer piping hot — before adding any glaze or frosting.

Finish: This cake isn’t overly sweet, so you can use a thicker frosting or a simple glaze. For the photos shown, a quick glaze made from powdered sugar, milk, and vanilla was poured over the cooled cake.

The finished bundt cake is soft, moist, fluffy, and flavorful. Serve it at room temperature or chilled — both are excellent. The cake often tastes even better after it rests for a day.

If you give this recipe a try, leave a comment to share how it turned out.

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