This is a recipe that mimics the traditional dish in color, texture and even taste. I got it from Vegetarian Times, October, 1995. They called it "Un-Meat Loaf"
Helpful Hints: Refrigerating overnight firms up the loaf for easy slicing.
Oat-walnut-mushroom mixture may require more or less cooking and you may need more or fewer bread crumbs, both depending on moisture content of oats.
Variations: Try adding 1 cup fresh or frozen corn kernels instead of carrots, or add a splash of red wine or hot sauce.
Substitute other varieties of mushrooms for the baby portabellas.