1-Step One: Prepare Your Pan and Workspace Start by lining an 8×8 or 9×9-inch square pan with parchment paper. Leave extra parchment hanging over the edges to create handles. These handles make removing the bars incredibly easy after chilling. Lightly grease the parchment with cooking spray or a small amount of butter to guarantee clean release. Gather all your ingredients and measure them precisely. Baking success depends on accurate measurements, especially for the powdered sugar. If your powdered sugar has been sitting in the pantry for a while, sift it to remove any lumps that could create grainy spots in your finished fudge.

2-Step Two: Create the Peanut Butter Fudge Layer Place ½ cup unsalted butter and 1 cup creamy peanut butter in a microwave-safe bowl. Microwave in 30-second intervals, stirring between each burst, until completely melted and smooth. This typically takes 60-90 seconds total. Alternatively, melt them together in a saucepan over low heat, stirring constantly to prevent scorching. Once melted and smooth, stir in 1 teaspoon vanilla extract. The warm mixture will release the vanilla’s aromatic compounds, distributing flavor throughout the base. Gradually add the 2 ½ cups sifted powdered sugar to the peanut butter mixture. Add it in three portions, stirring thoroughly after each addition. This gradual approach prevents lumps and ensures even distribution. The mixture will thicken considerably and become quite stiff. This is normal and exactly what you want for a proper fudge texture. Transfer the thickened peanut butter mixture to your prepared pan. Using a spatula or the back of a spoon, press it firmly into an even layer. Work from the center outward to create a uniform surface. The more evenly you spread this layer, the more professional your finished bars will look.

3-Step Three: Prepare the Chocolate Ganache Topping Place 2 cups semi-sweet chocolate chips and ¼ cup heavy cream in a clean microwave-safe bowl. Microwave in 20-second intervals, stirring well between each burst. The chocolate should melt gradually and combine with the cream to form a glossy ganache. This process usually takes about 60-80 seconds total. Stop microwaving when small lumps remain and stir vigorously. The residual heat will melt the remaining chocolate. Overheating can cause the chocolate to seize, becoming grainy and unusable. Once smooth and glossy, let the ganache sit for 2-3 minutes to cool slightly. This brief rest prevents it from melting into the peanut butter layer when you pour it on top.

4-Step Four: Assemble and Add Finishing Touches Pour the chocolate ganache over the peanut butter layer, tilting the pan gently to encourage even spreading. Use an offset spatula to smooth the surface if needed. Work quickly but carefully to achieve a uniform layer. If adding a salted element, now is the time. Sprinkle flaky sea salt or a pinch of coarse salt across the chocolate surface. Add chopped peanuts for extra crunch and visual appeal. Press them gently into the chocolate to make sure they adhere properly.

5-Step Five: Chill and Set Place the pan in the refrigerator for 2-4 hours or in the freezer for 1 hour. The bars need adequate time to set completely. Cutting too early results in messy, soft edges that don’t hold their shape. To test if the bars are ready, gently press the center with your finger. The chocolate should feel firm and not yield to light pressure. If indentation remains, return the pan to chill longer.

6-Step Six: Cut and Serve Once fully set, remove the pan from the refrigerator. Use the parchment paper handles to lift the entire block of peanut butter chocolate goodness onto a cutting board. This step makes clean, precise cuts much easier. Use a sharp knife to cut into 16 squares (4×4 grid) or 20 smaller rectangles. For the cleanest cuts, run your knife under hot water, dry it quickly, and slice. Wipe the blade between cuts for picture-perfect edges. These best no bake peanut butter fudge bars are now ready to serve. They taste best when allowed to sit at room temperature for 5-10 minutes before eating, which softens the chocolate slightly for optimal texture.