If you are making the egg-free version of this recipe, then start by soaking the chia seeds in the water in a small bowl, leave them aside for 10 minutes or so. If you are going to make this recipe with an egg then you can skip this step
Mix the brown sugar and melted butter together, I use a whisk for this step
Whisk in either the soaked chia seeds or an egg and the vanilla
Add the flour, mix well (I swap to a wooden spoon at this stage)
Add the rolled oats and mix well
Add the raisins and mix so they evenly through the mix
Pour the mix into lined slice tin (I use a 20 x 20 cm tin, a cake tin will also work if you don't have a slice tin
Bake at 180 degrees Celsius (350 F) for 20-25 minutes or until the edges are golden and start to come away from the edge of the tin
Allow to coo,l then slice into squares