This deliciously indulgent-but-feels-healthyish slice is packed with oats, peanut butter and melty chocolate goodness. It's everything you want in a slice with sweet, salty, and tasty in one great bite.
Preheat the oven to 180°C (350°F) and grease and line a 22cm x 30cm (9x13in) baking dish, or similar.
In the bowl of a stand mixer (or in a large bowl, using a hand beater) add all of the dry ingredients, in the order listed. Mix them gently together on low speed to break up the sugar.
Add the canola oil, eggs, peanut butter and vanilla and beat on low speed until combined. Add in the chocolate chunks and mix until evenly distributed.
Pour the mixture into the baking dish and spread evenly out to the sides. I use my hands to press the mixture into the edges and flatten it, but feel free to use a spatula!
Bake for 20-25 minutes or until golden brown and puffy and a skewer inserted into the centre comes out clean. Make sure you check at 20 minutes, as sometimes the top cooks faster than the middle. If it's browning too quickly, cover the dish with tin foil.
Once baked, leave to cool completely on a wire rack. Invert onto a wooden chopping board once cooled and cut evenly into squares. The slice will keep for up to 4-5 days in an airtight container.
If you do decide to use an egg substitute to make this vegan, I would add 1/4-1/2 a cup more peanut butter to ensure that the slice doesn't fall apart when you cut it.