A delightful treat combining the rich flavors of peanut butter and chocolate in a layered bar form.
Preheat your oven to 350°F (175°C).
Preheating ensures even baking from the start.
In a mixing bowl, combine the cake mix, peanut butter, butter, and egg until a crumbly dough forms.
Mix until just combined to avoid overworking the dough.
Press two-thirds of the dough into the bottom of a greased 9x13 baking pan to form an even layer.
Use the back of a spoon or your hands to press the dough evenly.
In a saucepan over low heat, melt the sweetened condensed milk, chocolate chips, and butter, stirring until smooth.
Stir constantly to prevent the chocolate from burning.
Pour the melted chocolate mixture over the dough layer in the pan, spreading it evenly.
Work quickly as the chocolate mixture will start to set as it cools.
Crumble the remaining dough over the chocolate layer, covering it partially.
Leave some gaps for a marbled effect.
Bake in the preheated oven for 25 minutes or until the top is golden brown.
Check for doneness by observing the edges; they should be set.
Allow the bars to cool completely in the pan before slicing into squares.
Cooling ensures the layers set properly for clean cuts.