Preheat oven to 325°F and line a 12-cup muffin tin with paper liners.
Mix crumbs and melted butter; press 1 tbsp into each liner to form crusts.
Beat cream cheese and sugar until smooth, then add egg, sour cream, vanilla, and salt until combined.
Fold in 1/3 cup cookie butter gently, keeping a marbled effect.
Spoon batter over crusts, filling about 3/4 full.
Bake 15–18 minutes until edges set and centers slightly jiggly.
Cool in pan 30 minutes, chill at least 2 hours, then drizzle extra cookie butter before serving.