In a skillet heat olive oil over medium high heat. Add the mushrooms and cook for 5-6 minutes until they are browned and soft. Remove from the pan and add to a casserole dish.
Return the skillet to the heat and melt butter in a pan. Add the rice. Cook the rice until lightly toasted, stirring frequently. Pour into casserole dish with mushrooms.
Stir in French onion soup and Beef consumee to the rice and mushrooms, and mix until everything is evenly combined.
Cover and bake for about 45 minutes, or until all liquid is absorbed.