Preheat oven to 190°C/fan 170°C/gas mark 5. Line a large baking sheet with greaseproof paper. Place the oats, carrot, blueberries, sugar, cinnamon, mixed spice, maple syrup and pecan nuts in a bowl and pour in the melted coconut oil and the mashed bananas. Combine until evenly mixed, then shape into 12 roughly 11x3cm rectangular bars.
Bake for 35-45 minutes, until golden and slightly crispy. Leave to cool for 5 minutes, then transfer to a wire rack to firm up.