Heat chocolate and butter in microwave until melted. Add sugar and stir till blended. Add eggs one at a time and mix well, then blend in vanilla. Combine dry ingredients in a separate bowl. Then add remaining flour and buttermilk alternating until mixed well. Spoon into heart whoopie pan. Bake in 350* for 15 to 20 minutes until toothpick comes clean.
Let cool on wire rack..
Coconut Pecan Frosting:
Combine first ingredients and cook, stirring over medium heat till mixture thickens about 12 to 15 minutes. Then add coconut and pecans.
Spoon Coconut Pecan Frosting and top with another heart. Use a small heart cookie cutter to place on top.