Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper.
In a mixing bowl, whisk together the flour, sugar, baking powder, baking soda, salt, and cinnamon until well combined.
In another mixing bowl, combine the buttermilk, egg, and melted butter. Mix until smooth.
Pour the wet ingredients into the dry ingredients, stirring gently with a rubber spatula until just combined. Be careful not to overmix.
Fold in the fresh blueberries gently, ensuring they are evenly distributed throughout the batter.
Using a tablespoon, drop spoonfuls of the batter onto the prepared baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for 12-15 minutes, or until the fritter bites are golden brown and a toothpick inserted in the center comes out clean.
Allow the fritter bites to cool on the baking sheet for a few minutes before transferring them to a cooling rack.
For extra sweetness, consider dusting the cooled fritter bites with powdered sugar before serving.