Combine the chopped pecans and bourbon in a small bowl. Cover and let sit at room temperature for at least 1 hour or overnight.
Beat butter with electric mixer and gradually add powdered sugar. Once mixture has completely come together, add pecan-bourbon mixture and mix. If mixture is too soft, add a little more sugar.
Use a small ice cream scoop or a teaspoon measuring spoon to form balls that are slightly larger then 1-inch. Place them on a baking sheet lined with parchment paper or wax paper and refrigerate until firm, at least 1 hour.
Melt chocolate chips and shortening in a heavy-bottomed saucepan over low heat, stirring constantly. Once smooth, start dipping the balls into the chocolate mixture using a toothpick. Place back on baking sheet and top with a pecan to cover the hole from the toothpick.
Return bourbon balls to refrigerator to set the chocolate.
Notes
Nutritional info is provided as an estimate only and will vary based on brands of products used.