In a food processor, blend the cashews and olive oil, scraping the sides of the bowl with a rubber spatula, until a creamy paste forms. Add the remaining cream topping ingredients. Blend until completely creamy and smooth.
Assemble the moussaka, opa! Grease a 9 x 13-inch casserole with olive oil and preheat the oven again to 400°F. Spread 1⁄4 cup of sauce on the pan, then add successive layers in order of eggplant, potatoes, sauce, and half the bread crumbs. Spread all the zucchini on top of this. Top with a final layer each of eggplant, potatoes, sauce, and bread crumbs. Use a rubber spatula to evenly spread the tofu nut cream over the entire top layer. Decorate top by scattering with pine nuts and healthy drizzles of olive oil. Dust the top generously with dried oregano and a tiny pinch of nutmeg.
Cover with foil and bake for 45 minutes, uncover and bake another 15, then broil top for 2-4 minutes until browned spots appear (for that authentic Greek homemade casserole touch). For easier slicing, cool 10 minutes to allow the topping to firm up.