Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large bowl, mix mashed bananas, egg, applesauce, honey, and vanilla.
In another bowl, combine oats, flour, cinnamon, baking powder, and salt.
Add dry ingredients to wet ingredients and stir until combined.
Gently fold in blueberries and sunflower seeds.
Drop 2-tablespoon portions onto the prepared baking sheet and flatten slightly.
Bake for 15-18 minutes until edges are golden.
Let cool on the baking sheet for 5 minutes, then transfer to a wire rack.
