Preheat oven to 350 and line 9″x13″ pan with nonstick foil.
In a large bowl, add 4 eggs, and beat with cocoa, salt, baking powder, and vanilla.
Stir until fully combined and smooth.
In the microwave, melt butter.
When melted, add sugar, and stir to combine.Add warm butter/sugar mixture to the egg/cocoa mixture, stirring until smooth.
Add the flour and stir until fully incorporated.
Spread 3/4 batter into prepared pan.
Pour on pumpkin cheesecake batter.
Plop on rest of brownie batter in small clumps.
Bake brownies about 40 minutes.
Cool and Cut.