Preheat oven to 175°C. Line an 8×8 inch baking pan with parchment paper.
Mix dry ingredients:
In a bowl, whisk together flour, cocoa powder, baking powder, and salt.
Prepare wet mixture:
In another bowl, mix melted butter and sugar until smooth.
Add eggs and vanilla and whisk well.
Combine:
Gradually add dry ingredients to the wet mixture and mix until combined.
Add peanut butter:
Pour batter into the pan.
Swirl peanut butter on top and sprinkle chocolate chips.
Bake:
Bake for 25–28 minutes until a toothpick comes out with moist crumbs.
Cool & serve.
Let cool completely, cut into squares, and serve.
Notes
Pro Tips:✔ Do not overbake for fudgy texture. ✔ Use good quality cocoa powder. ✔ Swirl peanut butter lightly for pattern. ✔ Let brownies cool before cutting. ✔ Store in airtight container for freshness.