Fill both your rocks glass as well as your cocktail shaker up with ice.
Use your jigger and measure out 2 oz of Peanut Butter Whiskey. Toss that into your cocktail shaker.
Use your jigger and measure out 1 oz of Kahlua. Toss that into your cocktail shaker.
Cover the shaker with it's top and shake well for 15 - 20 seconds.
Remove the top and put the strainer over the shaker. Pour the drink into your rocks glass.
Use the jigger and measure out 1 oz of heavy cream. Pour that over the top of the drink. You can use a bar spoon to stir it in some or leave it on top.