Preheat your oven to 350°F (175°C) and grease a 12-cup muffin tin or use liners.
In a large mixing bowl, whisk together the mashed banana, egg, yogurt, milk, and syrup until well combined.
Add the pancake mix, salt, and cinnamon. Stir until the batter is just combined, being careful not to overmix.
Gently fold in the blueberries with a silicone spatula.
Scoop the batter into the muffin tin, filling each cup about 3/4 full. Top with extra blueberries.
Bake for 15-18 minutes until golden brown and a toothpick comes out clean.