Preheat oven to 375 degrees. Line a 9x5 loaf pan with parchment paper, spray or brush with cooking oil, and set aside.
In a medium bowl, mix almond milk, coconut oil, ground flaxseeds, and vanilla. Set aside.
Whisk gluten-free all-purpose flour, cane sugar, baking powder, cinnamon, and salt in another bowl.
Add the almond milk mixture with the flour mixture and stir to fully combine using a spatula.
Fold the mashed banana, followed by the blueberries, into the batter to combine.
Transfer the batter to the prepared pan and bake for 90 minutes or until a fork inserted in the center comes out clean.
Remove the finished bread from the oven and transfer it to a wire rack; allow to cool for 5 minutes, then remove the bread from the pan using the parchment paper. Remove the paper and cool completely.
Store cooled bread in an airtight container on the counter for 3 days.