Preheat oven to 350°F and spray an oven-safe baking dish, 8x8
Combine butter, sugar, eggs, salt, and vanilla
Add cocoa powder, flour, baking powder, and chocolate chips, stirring until combined
Spread in baking dish and place in oven
Cook 15-30 minutes, or until a toothpick comes out clean
Allow it to cool, then cut into small pieces