Add mint leaves and simple syrup into a julep cup and gently muddle. Add ice and top with Maker’s Mark® Bourbon. Stir until glass is chilled. Garnish with a mint sprig.
To make your own simple syrup, combine 1 cup of granulated sugar and 1 cup distilled water in a saucepan and bring to a boil. Stir constantly until sugar has dissolved. Set aside to cool.