Preheat oven to 180°C (350°F). Grease your springform pan and pour the brownie batter evenly across the bottom. Bake for 20-25 minutes, then cool completely.
Beat softened cream cheese until smooth. Gradually add sugar and vanilla, mixing well. Incorporate eggs one at a time. Add sour cream and butterscotch sauce, blending until smooth.
Pour the cheesecake filling over the cooled brownie crust, smoothing evenly. Bake at 160°C (320°F) for 50-60 minutes until set. Cool thoroughly, then refrigerate for at least 4 hours or overnight.
Decorate with whipped cream, caramel drizzle, or themed sprinkles before serving. Add whipped cream and caramel for a butterbeer-inspired top.
