Preheat your oven to 350°F/175°C and line two baking sheets with parchment paper.
In a large bowl, whisk the partially melted butter, cane sugar, brown sugar, egg, vanilla extract, lemon zest, and lemon juice until smooth.
In another bowl, whisk together the flour, baking soda, and salt.
Add the dry ingredients to the wet, mixing until just combined.
Use a rubber spatula to fold in the blueberries, being careful not to overmix.
Freeze the dough in the bowl for 5 minutes then use a 1.5-tablespoon cookie scoop to scoop the dough into round cookie dough balls. Place them 2 inches apart on your prepared cookie sheet.
Lightly press down on the cookie dough balls until they’re about 1/4 inch thick. Bake one baking sheet at a time for 10-12 minutes, or until the edges are lightly golden.
Let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.