This peanut butter fudge bars recipe combines cake mix and sweetened condensed milk to produce soft, fudgy bars that everyone will ask for again and again.
If I had to pick my all-time favorite cookie bar, these Peanut Butter Fudge Bars would be at the top of the list. The recipe came to me from my sister years ago and quickly became a household staple. They’re the kind of dessert that travels well to potlucks, bake sales, and family gatherings, and they also freeze beautifully for make-ahead treats.
These bars feature a tender peanut butter cookie crust and crumbly topping that frame a rich, fudgy chocolate center made with sweetened condensed milk. People often call them “can’t-leave-alone bars” because they disappear fast—so if you bake a pan, plan to share or hide a few for yourself.
Ingredients for Peanut Butter Fudge Bars
Simple pantry ingredients come together in just a few steps. Quantities below are for a 9×13-inch pan that yields about 12 bars.
- 1 package yellow or white cake mix
- 1 cup creamy peanut butter
- 1 large egg
- 1/2 cup vegetable or canola oil
- 1 (14-ounce) can sweetened condensed milk
- 1 cup semi-sweet chocolate chips (or any chocolate chips you prefer)
- 2 tablespoons butter
Recipe Details
- Yield: 12 bars
- Prep Time: 10 minutes
- Cook Time: 35 minutes
- Total Time: 45 minutes
Step-by-Step Instructions
Step 1: In a large bowl, combine the cake mix, peanut butter, egg, and oil. Stir until the mixture is evenly blended into a thick dough.
Step 2: Reserve about one-third of the dough for the topping. Press the remaining two-thirds of the dough evenly into the bottom of a greased 9×13-inch pan. Bake at 350°F (175°C) for approximately 10 minutes, until set but not browned.
Step 3: While the crust is baking, melt the sweetened condensed milk, chocolate chips, and butter together. You can do this gently in the microwave in short bursts, stirring between intervals, or on the stovetop in a small saucepan over low heat, stirring until smooth. Pour the melted chocolate mixture evenly over the prebaked crust.
Step 4: Crumble the reserved dough into small pieces by rubbing it between your fingers and sprinkle the crumbs over the chocolate layer. Return the pan to the oven and bake for 20–25 minutes, or until the top is just turning golden brown.
Step 5: Remove from the oven and let cool slightly. For the cleanest slices, cut the bars while they are still a little warm; they will finish setting as they cool. Store leftovers in an airtight container or freeze individual portions for later.
Nutrition (per serving)
Calories: 364 | Total Fat: 30g | Saturated Fat: 8g | Unsaturated Fat: 22g | Cholesterol: 22mg | Sodium: 146mg | Carbohydrates: 24g | Fiber: 2g | Sugar: 17g | Protein: 7g
Tips for Perfect Peanut Butter Fudge Bars
- The topping dough will be quite thick; take small handfuls and rub them between your fingers to form fine crumbs that sprinkle easily.
- Avoid overbaking. Remove the pan when the top is only beginning to turn golden brown so the center stays fudgy.
- Slicing while slightly warm yields neater pieces; allow bars to cool completely if you prefer firmer slices.
- These bars freeze well—wrap individual pieces or freeze the whole pan, then thaw at room temperature when ready to serve.
Why this recipe works
Using boxed cake mix simplifies the dough while still delivering a tender texture. Creamy peanut butter adds classic flavor and richness to both the crust and the crumb topping. The sweetened condensed milk combined with melted chocolate creates a dense, fudgy center without tempering chocolate or complicated techniques—perfect for busy bakers who want an impressive, comforting dessert with minimal fuss.
More baking ideas to try
- Peanut butter and chocolate are a natural pair—try them together in quick drop cookies for another easy treat.
- Brownies baked in a shallow pan with a simple glaze make a fast, crowd-pleasing dessert.
- Oatmeal cookies with chocolate chips are a comforting option for lunchboxes and snacks.
- Fresh apple cookies with a vanilla glaze are a seasonal favorite and a great way to use extra fruit.
Enjoy these Peanut Butter Fudge Bars at gatherings, as an afternoon treat, or whenever you need a reliable, irresistible dessert. Happy baking!