Preheat oven to 325.
Stir and whisk flour, confectioners sugar, cocoa powder and salt in small bowl
Melt butter in microwave then pour into dry ingredients. Mix thoroughly.
Press dough evenly with fingers into 4” tart pans …. First around outside then bottom.
Trim off overhang at top. Reuse trim pieces.
Pierce bottom with fork several places.
Place pans on baking sheet and set timer for 18 minutes.
Check at 16 minutes. Probably needs a few more minutes. Check every minute. Best to underbake as it goes back in oven to bake filling.
Let cool before filling.