Directions

1. Preheat oven to 350 degrees, with racks in upper and lower thirds. In a medium bowl, whisk together flour, baking soda, and salt; set aside.
2. Make filling: Place chocolate in a medium heatproof bowl set over (not in) a saucepan of simmering water; stir frequently until almost melted. Remove from heat; stir until completely melted. Stir in cream; set aside to cool and thicken, about 30 minutes.
3. Meanwhile, using an electric mixer on high speed, beat butter, peanut butter, and sugar in a large bowl until light and fluffy. Reduce speed to low; add flour mixture, and mix just until blended (do not overmix).
4. Drop dough by heaping teaspoons onto two baking sheets, about 1 1/2 inches apart. With the bottom of a damp glass, lightly flatten each mound of dough into a 2-inch round. Bake until golden around edges, 12 to 14 minutes, rotating sheets halfway through. Transfer cookies immediately to a wire rack to cool completely.
5. With a small offset spatula or table knife, spread bottom of half the cookies with 2 teaspoons filling each; sandwich with remaining cookies, pressing gently to spread filling to the edge. Let set for 15 minutes before serving.