Much thanks to a recipe posted on The Kitchn for introducing me to the magic missing ingredient that, in tandem with all the others, makes granola clump up so well - oat flour! Simply blitzing some old fashioned rolled oats in a food processor until they're powder will work perfectly.
Maple Nut Granola
Makes about 8 cups
*3 cups oats, 1 blitzed to powder, the other two blitzed a few times to break 'em up
*2 cups coarsely chopped raw nuts (I used hazelnuts, almonds, pecans, pistachios)
*1/2 teaspoon ground cinnamon
*1/4 teaspoon ground nutmeg
*1/3 cup maple syrup
*1/4 cup brown sugar
*1/8th cup almond oil
*2 tablespoons butter
*1 tablespoon water
*Big pinch kosher salt
*1/2 teaspoon vanilla extract
*1 cup dried fruit (I used cherries and cranberries)
Preheat the oven to 280. In a large bowl, combine the oats, oat powder, nuts and spices. Heat the syrup, butter, oil and sugar together in a small saucepan over medium heat until the butter has melted and the mixture is hot. Stir in the vanilla and salt and then pour the hot sweet sludge over the oats and nuts, combining well to coat. When it's uniformly moist, let it sit a few minutes.
Spread the mix out on a large baking sheet, separating it into clumps with your fingers, and allowing for space between the clumps. Slide into the middle of the oven and bake for 30-40 minutes, rotating once or twice, or until the top is golden brown. Remove from the oven and flip clumps over, gently breaking up the knots into smaller clumps. Return to the oven and bake another 10 minutes or so before stirring again. Take stock of the granola - is it as crunchy and browned as you'd like it to be? If you want to push on further, continue the stir-check cycle in 8-10 minute increments. When it's to your satisfaction, cool completely, then stir in any dried fruit you want to use.
Store in an airtight container at room temperature and it'll keep for a couple weeks (but it won't last nearly that long).