Using a food processor, crush tea biscuits into fine crumbs, then mix it with melted butter. Press bottom side up on a spring form pan, and bake for 5 minutes on preheated 350 F
Meanwhile cream sugar and cream cheese until fluffy, then beat in eggs one at a time, followed with vanilla essence and flour, mix until just combined
Divide batter into two, and mix one with peanut butter, while the other with melted chocolate chips (I melted them quickly in microwave at 30 seconds intervals)
Pour each batter alternating one after another, creating marble effect. Bake cheesecake on preheated 350 F until firming up but center still somewhat jiggling, for 50-60 minutes
Cool on rack then chill for 4 H at least, if not overnight