2. Dump the mushroom slices into a bowl. Drizzle or spray the mushrooms with the oil. Use your hands and toss the pieces to coat them in oil. (You don’t need much oil at all; they shouldn’t be ...

In a small bowl, toss the cracker crumbs with the melted butter and scatter them over the casserole. Cover with foil and bake for about 30 minutes, until bubbling.