Method:
Heat oil in a large skillet over medium-high heat. Add tempeh, carrots and onions; cook until onions are translucent, about 5 minutes. Add potatoes, broth, tamari and thyme; simmer until potatoes are just tender, 15 to 20 minutes. Stir in corn, peas, salt and pepper and bring to a simmer. Combine the cornstarch in a small bowl with 1/4 cup water; mix until smooth and stir into the skillet, stirring until combined and slightly thickened. Stir in sage.
Preheat the oven to 375°F.
Transfer tempeh mixture to an ovenproof casserole or baking dish. Top with yams and spread out evenly. Sprinkle with almonds and bake until the yams and almonds are golden brown and the filling is bubbling, 25 to 30 minutes.