1. Preheat the oven to 180°C/gas mark 4. Lightly grease a 15cm x 25cm baking dish or tray with sunflower oil, line with non-stick baking paper and set aside.

2. Place the oats in a large bowl and add the raisins, your choice of chia, coconut or seeds (or a mix of all three), the milled flaxseeds, baking powder and cinnamon. Toss everything together and make a well in the centre.

3. Beat the milk, egg and honey together in a jug or bowl until well blended. Stir in the grated squash and orange zest. Pour this into the well in the dry ingredients and mix until fully combined. Pour into the prepared baking dish or tray, levelling the top.

4. Bake in the oven for 20 minutes, until crisp and golden on top and just set. Remove and leave to cool a little in the tin before leaving on a wire rack to cool completely. Cut into 12 equal-sized bars and serve. These will keep for a few days in an airtight container in the fridge.

TIP - Instead of (or as well as) squash, these will work well with carrot, parsnip and even beetroot too.