Preheat your oven to 350°F (175°C). In a mixing bowl, combine melted unsalted butter with crushed OREO cookies, stirring until well combined. Use a mini cheesecake pan and form 1-inch balls with the mixture, pressing them into the bottoms to create a crust. You want them to be compact and evenly spread for a delicious base.

In a large bowl, beat softened cream cheese until smooth. Gradually add sugar, eggs, and vanilla extract, mixing thoroughly. Slowly incorporate flour, then add green food coloring drop by drop, mixing until you achieve your desired Frankenstein green hue. The batter should be creamy and free of lumps, perfect for the mini cheesecakes.

Pour the cheesecake batter into the mini cheesecake pan, filling each crust almost to the top. Place the pan in the preheated oven and bake for about 15 minutes. The cheesecakes are done when they are set but still slightly jiggly in the center, indicating a creamy texture inside.

Once baked, remove the pan from the oven and let the cheesecakes cool completely. Carefully release the cheesecakes from the pan and set them on a wire rack. Dip the tops into melted chocolate, and then into chocolate sprinkles for a festive touch. Use the melted chocolate to pipe fun mouth designs and attach edible eyes for the full Frankenstein effect.