In a large bowl add flour, cocoa, baking powder, salt. Whisk together ingredients until they are fully incorporated.
In the bowl of a stand mixer or in a large bowl using a hand-held mixer, beat the eggs, sugar, butter, and vanilla until light and fluffy.
With the mixer off, add in the flour mixture. Turn mixer on low and mix until ingredients are well combined.
Pour the brownie mixture on the bottom of a prepared 9-inch springform pan.
Bake for 12 minutes. Meanwhile, prepare the cheesecake mixture.