This is based on a recipe in Peter Berley's Fresh Food Fast, but it eliminates the standing over the stove part.
2 cups baby portobella mushrooms, quartered
2 pounds small potatoes, halved
1/2 onion, diced
3 cloves garlic, minced
1 8 oz. package tempeh, cut into small dice
2 Tbsp arrowroot powder OR flour
1 tsp garlic powder
2 tsp nutritional yeast (optional)
1 Tbsp olive oil
2 tsp soy sauce
1/2 cup water
Toss the tempeh with the arrowroot, garlic powder and yeast. Mix the mushrooms, potatoes, onion and garlic in a baking dish. Add the olive oil, soy sauce and water. Add the tempeh mixture and mix well to combine. Cover the dish tightly with foil and bake at 400 degrees for 45 minutes, or until the potatoes are tender.