Prepare baking pan: Line parchment paper in a 9″ x 13″ pan allowing 2 inches to hang over sides and spray it with cooking spray. Preheat oven to 350 F degrees.
Preheat oven to 350 F degrees.
Combine chocolate and butter: Add the butter and chocolate to a microwavable bowl and microwave it for 30 seconds at a time, stirring after every 30 seconds until smooth.
Prepare dry ingredients: Whisk together flour, baking powder, and salt in a separate bowl; set aside.
Prepare wet ingredients: Add the sugar, eggs, and vanilla in the bowl of an electric mixer fitted with the whisk attachment, and beat on medium speed until pale, about 4 minutes. Add chocolate mixture and cocoa powder and beat until combined. Add flour mixture; beat, scraping down sides of bowl, until well incorporated.
Bake: Pour batter into prepared pan; smooth top with a rubber spatula. Bake for 15 minutes, we do not want to bake the brownie completely as it will continue to bake with the cream cheese layer.