Preheat the oven to 325-degrees F. Line a baking sheet with parchment paper or a silicon mat.
Combine the egg, mashed banana, milk, vanilla extract, honey, and coconut oil in the bowl of an electric mixer fitted with a whisk attachment. Beat until combined.
In a large mixing bowl, combine the quick-cooking oats, all-purpose flour, baking powder, cinnamon, wheat germ and brown sugar and gently whisk to combine.
Add the dry mixture to the mixer a little at a time on the lowest speed. Remove from the mixer and scrape down the edges.
Fold in the chocolate chips, walnuts and blueberries until just combined. This is a wet batter, so don't be surprised if it looks very loose.
Scoop the cookie mixture onto the prepared baking tray. I like using a cookie scoop.
Bake for 10-15 minutes until the edges are golden brown. Let set for 10 minutes on the tray before removing to a wire rack to cool completely.