Prep the pan: Line a 12-cup muffin tin with paper liners. Place one whole Oreo flat-side down into each liner to form the crust.
Preheat the oven: Set to 325°F (163°C).
This slightly lower temperature helps keep the cheesecakes smooth and creamy.
Soften the cream cheese: Let it sit at room temperature for 30–45 minutes. Soft cream cheese mixes smoothly and prevents lumps.
Make the batter: In a mixing bowl, beat the cream cheese with an electric mixer on medium speed until creamy, about 1–2 minutes. Add sugar and beat until smooth.
Add eggs: Beat in the eggs one at a time, mixing just until incorporated after each.
Avoid overmixing to reduce air bubbles.
Finish the filling: Add sour cream, vanilla, and a pinch of salt. Mix until silky and uniform. If using crushed Oreos or chocolate chips, fold them in gently with a spatula.
Fill the cups: Divide the batter evenly among the liners, filling each almost to the top (about 3/4 full to slightly under the rim).
Bake: Bake at 325°F for 16–20 minutes, or until the edges are set and the centers have a slight jiggle.
They should not brown on top.
Cool gradually: Let the pan cool on a rack for 15–20 minutes. Transfer cheesecakes to the rack to cool completely.
Chill: Refrigerate for at least 2 hours, ideally 4 hours or overnight, for the best texture and flavor.
Top and serve: Add whipped cream, berries, ganache, or a drizzle of caramel. Finish with a sprinkle of crushed Oreos if you like.