A family-favourite recipe for fudgy one-bowl brownies, because everyone needs and easy and delicious brownie recipe to rely on!
Line an 8-inch baking pan with parchment paper and spray with cooking spray. Preheat oven to 350F.
In a mixing bowl, mix the butter and sugar and vanilla extract together. Add the eggs and mix until well-combnined.
Add the flour, baking powder and cocoa powder then mix until just combined.
Fold in chocolate chips and chopped walnuts (opional).
Transfer the the batter evenly into the prepared baking pan. Bake for 20 minutes, until a toothpick comes out clean. Cool and cut into squares, then serve.