Prepare: Preheat the oven to 150°C fan/170°C/325°F/Gas Mark 3 and line a 20x20cm cake tin with parchment paper.
Mix the dry ingredients: Mix the porridge oats, rice crispies, mixed seeds and dried fruit together in a large mixing bowl.
Melting time: Melt the butter, honey and sugar together in a saucepan over a low heat until all the sugar has dissolved, then turn the heat up and let it bubble for 1 minute.
Combine everything: Pour the hot sugar and butter into the oat mix and stir everything together, making sure everything is coated in the butter.
Into the tin: Tip the mix into the lined tin and use the back of a spoon to press the mixture down evenly and firmly. Sprinkle over the flaky salt if using.
Bake: Bake for 15 minutes, then leave to cool in the tin before slicing.
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