Preheat oven to 180 degrees. Line muffin tray with paper baking cups.
Combine dry ingredients and set aside.
Combine mashed bananas, oil, egg and milk in a bowl. Add to dry ingredients and mix gently, it doesn't matter if there are lumps.
Fold blueberries through the mixture.
Spoon mixture into lined paper baking cups and put in the oven for 10-15 minutes (or until golden brown).
Sprinkle with cinnamon and leave to cool on a wire rack.
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