Cream butter and sugar until light and fluffy, about 2 minutes.
Beat in egg and vanilla extract.
Whisk flour and salt; mix into wet ingredients until just combined.
Roll into 1-tablespoon balls, press a shallow indent, pinch closed any cracks.
Freeze shaped dough 10 minutes.
Preheat oven to 350°F. Bake plain dough balls 9-10 minutes, until just set.
While warm, re-press the indent. Melt caramels with cream until smooth; spoon into each well.
Let caramel set 15 minutes, then drizzle with melted chocolate.
Let chocolate set fully before serving.