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
Video
Notes
Egg-free option: Use 1 tablespoon chia seeds soaked in 2 tablespoons of water (a “chia egg”) instead of a regular egg.
Flour: Works with standard plain flour or a gluten-free blend. Avoid coconut flour—it makes the slice too crumbly.
Butter: Gives the slice its lovely flavor and texture. The recipe will also work with a full fat dairy-free margarine or coconut oil.
Sugar: Brown sugar gives a nice depth, but any granulated sugar such as coconut sugar or white sugar also work.
Raisins: Can be swapped for chopped dates, apricots, sultanas, or whatever dried fruit your family enjoys.
Chewy or soft? For a softer texture, increase the flour to oat 1 cup flour to 1 cup oats.
Line the tin with baking paper so the slice lifts out easily for cutting.
Don’t over bake—remove when the edges are golden and starting to pull away from the tin. The centre will firm as it cools.
Perfect for lunchboxes, also freezes really well, so you can make a double batch for a freezer stash.