Preheat oven to 325°F (163°C). Line or lightly grease a mini muffin pan.
Crush cookies, mix with melted butter, and press 1 tablespoon into each cup.
Beat cream cheese and sugar until smooth. Add egg, vanilla, sour cream, and salt. Stir in chocolate chips or swirl in melted chocolate.
Spoon filling over crusts. Bake 14–16 minutes until just set with a slight jiggle.
Cool in pan, then chill in fridge for at least 2 hours.
Top with whipped cream, chocolate, or berries. Serve chilled.