Place the chopped pecans and bourbon together in a bowl; allow them to steep for 1 hour.
Using an electric mixer, blend the softened butter with the powdered sugar until the mixture becomes smooth.
Fold the steeped pecans and bourbon into the butter-sugar blend and mix until evenly distributed.
Refrigerate the mixture for 1 hour to firm it up.
Shape the chilled mixture into 1-inch balls and arrange them on a cookie sheet lined with waxed paper. Place in the refrigerator for 2 hours.
Microwave the chocolate in 30-second bursts, stirring between each, until fully melted. Spear each bourbon ball with a fork, submerge it in the melted chocolate to coat entirely. Let the ball hover above the chocolate for a few seconds so excess coating drips away. Return it to the waxed paper to set completely. If adding a pecan half, nuts, or salt, press the garnish onto the ball right away before the chocolate sets and hardens.