01 -
Heat your oven to 425°F. Line a baking sheet with foil. Prick each sweet potato several times with a fork, then place them on the baking sheet. Roast until they're completely tender when pierced with a knife, about 60 minutes.
02 -
While the potatoes are roasting, combine the oats, pecans, walnuts, garlic, maple syrup, olive oil, thyme, rosemary, salt, and pepper in a food processor. Pulse just until the mixture comes together but still has texture - don't over-process! Set aside until needed.
03 -
Lightly brush an 9x13-inch baking dish with olive oil to prevent sticking.
04 -
When the sweet potatoes are done, let them cool just enough to handle. Split them open and scoop the orange flesh into your food processor. Add the olive oil, milk, ginger, salt, and pepper. Process until smooth and creamy, adding a splash more milk if needed for a silky consistency.
05 -
Spread the sweet potato mixture evenly in your prepared baking dish. Sprinkle the crumble topping over the surface, then scatter additional nuts and fresh sage leaves on top. Drizzle lightly with olive oil. Bake for 20 minutes, until the topping is golden brown and fragrant.