Preheat the oven to 160°C, fan 140°C, gas mark 3. Melt the butter with the honey and vanilla essence in a small pan.
Mix the oats, berries, nuts and seeds, and mixed nuts into the melted butter mixture and stir well.
Spread out over a large baking tray and bake in the preheated oven for 45 minutes, stirring every 5 minutes, until golden.
Remove from the oven and leave to cool. Store the granola in an airtight container at room temperature for up to 1 month.
Crumble into be good to yourself Greek style natural probiotic yogurt and add half a peeled and sliced pear for a tasty breakfast option.
Cook's tip: This granola is also great in fruity desserts. Try coring an apple and stuff with granola, then bake until soft and serve with ice cream; or make your favourite crumble recipe and add a handful of granola to the crumble mix for an crunchy topping.