Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners or lightly grease it.
In a large mixing bowl, combine the whole wheat flour, almond flour, rolled oats, baking powder, baking soda, salt, and cinnamon. Stir until mixed well.
In another bowl, whisk together the honey (or maple syrup), applesauce, egg, and vanilla extract until smooth and well combined.
Pour the wet ingredients into the dry ingredients and stir gently until just combined. Be careful not to overmix; a few lumps are okay.
Fold in the fresh blueberries and chia seeds (if using) gently, so they don’t break apart.
Evenly distribute the muffin batter into the prepared muffin tin, filling each cup about ¾ full.
Bake in the preheated oven for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Remove the muffins from the oven and let them cool in the pan for 5 minutes before transferring them to a wire rack to cool completely.
Notes
Serve warm, dusted with powdered sugar and garnished with a fresh blueberry.