Preheat oven to 350°. Combine first 3 ingredients in a large bowl; stir to blend. Drop dough by heaping tablespoons onto a greased baking sheet to make 12 “cookies.” Smooth tops evenly and shape cookies into a round shape with a spoon if needed. Bake 12-14 minutes or until a toothpick inserted in the center comes out clean. Cool cookies completely. Combine chocolate sauce and powdered sugar; stir until smooth. Spread an equal amount of powdered sugar filling on each of 6 cookie bottoms. Press a second cookie bottom on top of cream filling to form a sandwich. Chill until served.