In a mixing bowl, combine the creamy peanut butter, softened butter, powdered sugar, vanilla extract, and salt. Use an electric mixer to blend the ingredients until smooth and well combined.
Line a baking sheet with parchment paper. Roll the peanut butter mixture into small balls, approximately 1 inch in diameter, and place them on the prepared baking sheet. Leave some space between each ball to prevent sticking.
Chill the peanut butter balls in the refrigerator for about 15-20 minutes, or until they are firm.
While the peanut butter balls are chilling, melt the semi-sweet chocolate chips and vegetable shortening in a double boiler or microwave-safe bowl. If using a microwave, heat the chocolate in 30-second intervals, stirring between each interval, until completely melted and smooth.
Using a fork or toothpick, dip each chilled peanut butter ball into the melted chocolate, ensuring it is fully coated. Gently tap off any excess chocolate.
Place the chocolate-covered peanut butter balls back on the parchment-lined baking sheet and refrigerate for an additional 10-15 minutes to allow the chocolate to set.