In a sturdy glass or mason jar, add the fresh blueberries, mint leaves, fresh lime juice, and simple syrup between two glasses. Using a cocktail muddler or the back of a wooden spoon, gently press down and twist just enough to release the blueberry juices and the fragrant mint oils. Be careful not to over-muddle the mint, as it can turn bitter.
Fill the glass all the way to the top with ice cubes. The more ice, the colder and more refreshing your mocktail will be!
Pour club soda or sparkling water over the muddled mixture until the glass is almost full. The bubbles bring everything together and give the drink its light, fizzy finish.
Using a long spoon or straw, gently stir the drink from the bottom up to evenly distribute the blueberries, mint, and lime throughout the glass.
Finish by garnishing with a few extra mint leaves, a couple of lime slices, and a sprinkle of fresh blueberries if you like.
Serve your Blueberry Mojito Mocktail immediately while it's icy cold and wonderfully fizzy. The mentioned recipe ingredients yields two servings.