32ouncesportabello mushroom soup- it comes in a box, you can also use your favorite mushroom soup - if it is condensed make it at least 16 oz. of soup and the rest liquid - just add enough water or vegetable broth to make 32 ounces
2teaspoonssea salt- it seems to need this much salt to balance the mushrooms - you can just add 1 teaspoon until after cooking and see if you want to add the other teaspoon
Add to the slow cooker - rice, soup and water if you bought a condensed soup to make 32 ounce total liquid, onion, melted butter, salt and pepper.
Lay the sliced mushrooms on top of the ingredients in the crockpot. Push down lightly.
This helps keep all the rice under the liquid and allows the mushrooms to cook at a bit of a slower pace.
Cook on low 6 to 8 hours on medium or 3 hours on high.