Preheat oven to 325; line 8x8 baking dish with parchment paper.
Press cookie dough into baking dish, bake for 7 minutes. Remove from oven and allow to cool.
Combine cream cheese, sour cream, and sugar in stand mixer.
Add egg and vanilla; mix until well combined.
Pour cheesecake filling on cookie dough, add mini Reese's on top.
Bake for 25-30 minutes. Allow to cool completely before slicing.