01 -
Preheat the oven to 175°C and grease a 23x33 cm baking pan or line with parchment paper for easy removal.
02 -
In a large mixing bowl, beat the softened butter, creamy peanut butter, brown sugar, and granulated sugar with a mixer on medium speed until light and fluffy, about 3–5 minutes.
03 -
Add eggs one at a time to the creamed mixture, mixing well after each addition. Blend in the vanilla extract.
04 -
In a separate bowl, whisk together flour, baking soda, and salt. Gradually add the dry mixture to the wet ingredients and mix until just combined.
05 -
Gently fold in the chocolate chips and halved mini peanut butter cups until evenly distributed in the dough.
06 -
Spread the thick dough evenly into the prepared pan using a spatula or your hands to flatten the surface.
07 -
Bake in the preheated oven for 25–30 minutes until the edges are golden and a toothpick inserted into the center comes out with a few moist crumbs.
08 -
Let the bars cool in the pan for 10 minutes, then transfer to a wire rack to cool completely. Slice into squares and serve warm for extra gooeyness, or let cool further for firmer texture.