Preheat Oven to 190°c. Line a lamington pan (18 x 28cm) with baking paper.
Make your seed mix by mixing black chia seeds, sesame, linseed, sunflower into a jug, then pour into an airtight container or jar to store.
Combine oats and 1½ cups of seed mix into a bowl with a fork.
Melt together honey and coconut oil.
Add into the dry mix & use a wooden spoon or spatula to mix. Once combined scrape into the pan. Smooth evenly.
It may not reach the other end so make sure you keep it at least 1cm thickness as it will spread during cooking.
Bake for 20mins or until the golden on top.
Leave to cool completely in the pan before transferring onto a board. Remove the paper & cut into rectangles. Store in a lined airtight tin.