01 -
Place a stick of butter in an 11 x 13-inch casserole dish.
02 -
Put dish in oven preheated to 350°F (175°C), and allow butter to melt.
03 -
Once melted, carefully remove dish from oven. Add rice, French onion soup, beef consomme, and sliced mushrooms, allowing them to pool atop melted butter.
04 -
Gently stir with fork or spoon, ensuring rice is well dispersed throughout liquid.
05 -
Place dish back in oven and bake for 30 to 40 minutes, or until top is golden and inviting.