Line 2 baking sheets with parchment paper or silicone mat, and set aside.
In the container of a food processor, add the shortbread cookies and powdered sugar. Pulse for 30 seconds to 1 minute or until you have fine crumbs.
Add the softened cream cheese and Skrewball peanut butter-flavored whiskey to the food processor and pulse for an additional 20-30 seconds or until the mixture is smooth and all the cream cheese has been fully incorporated.
Using a 1.5-inch (1.5 tablespoon) cookie scoop, scoop out a level scoop of the whiskey ball mixture and place it onto one of the prepared baking sheets. Repeat until all the cream cheese mixture has been scooped.
Place the baking tray into the refrigerator for about 5 hours to allow the whiskey balls to firm up enough to be rolled and dipped into chocolate.
Once the whiskey balls have firmed up, roll each ball in the palm of your hand to make smooth balls for dipping. You can place your tray of smooth whiskey balls back into the refrigerator to stay cold while you melt your chocolate.
In a microwave-safe bowl, add the milk chocolate melting discs and microwave on high for 1 minute, stir, then melt in 30-second intervals until the chocolate discs are fully melted. Be sure to stir the chocolate between each time in the microwave. Do not overheat your chocolate. Stir until smooth. Allow the melted chocolate to cool slightly before dipping your whiskey balls into it. Tip: Keep the chocolate warm/melted by putting the bowl over a pot of hot water.
Place a whiskey ball onto a fork and dip the ball into the melted chocolate. Once the ball is fully coated with chocolate, lift the fork out of the chocolate and tap it onto the edge of the bowl to allow any excess melted chocolate to drip off the bottom of the chocolate-coated whiskey ball. Tips: Only take a few of the balls out of the fridge at a time. Dip them and then get a few more balls out to be dipped. Keeping them cold makes it easier to dip.
Using a toothpick or separate fork, gently slide the coated whiskey ball off the fork and onto the second parchment-lined baking tray. Repeat until all the whiskey balls are coated in the milk chocolate.
Add the peanut butter chips and coconut oil to a small microwave bowl to make the peanut butter drizzle. Heat for 1 minute at (50-60% power), stir, then heat again in 30-second intervals until the chips are melted. Be sure to stir between each 30-second burst. Stir until smooth.
Transfer the melted peanut butter chips to a piping bag with a small amount of the tip snipped off. Pipe a drizzle of the melted peanut butter chips in a decorative pattern over the tops of all the chocolate-coated whiskey balls.
Place the tray of whiskey balls back into the refrigerator for 15 minutes to allow the chocolate and peanut butter to firm up before serving.
Notes
Keep the chocolate warm/melted by putting the bowl over a pot of hot water. When dipping, only take a few of the balls out of the fridge at a time. Dip them and then get a few more balls out to be dipped. Keeping them cold makes it easier to dip.