Beat first 3 ingredients at medium speed with an electric mixer until blended. Add egg yolk, orange juice, and almond extract, beating until mixture is blended.
Combine flour, baking powder, and salt; gradually add to butter mixture, beating until blended. Stir in 3 cups coconut. Cover and chill 1 hour.
Shape dough into 1-inch balls; roll balls in remaining 2 cups coconut, and place on ungreased baking sheets.
Bake at 350° for 11 to 13 minutes or until cookies are lightly browned. Remove from oven, and press 1 chocolate into center of each warm cookie. Cool on baking sheets 1 minute. Remove to wire racks to cool completely.