Add Bourbon, Mint, Blueberries, and Lemon into shaker without ice. Add sugar on top and muddle. (Sugar is key to rip apart the mint.) Add ice and shake for at least a minute. Strain into glass with ice and top off with club soda.
Use ingredients to taste. I generally don't mind the mint and sugar so I do around 8 blueberries, 8 small mint leaves, and 3 teaspoons of sugar.