Preheat oven to 325°F (160°C) and grease a springform pan.
Mix cookie crumbs with melted butter, press into pan base, and bake crust for 10 minutes then cool.
Beat cream cheese, peanut butter, and sugar until smooth and creamy.
Add eggs one at a time, mixing gently after each addition.
Mix in sour cream and vanilla extract until combined.
Fold crushed Butterfinger pieces into batter.
Pour batter over crust and smooth the top.
Bake 55–60 minutes until center is just set.
Cool gradually, then refrigerate at least 4 hours or overnight.
Top with whipped cream and extra candy before serving if desired.