2 cups converted rice (such as Uncle Ben's®)
1 (4 ounce) can mushroom stems and pieces
½ cup water
6 green onions, chopped
2 teaspoons butter, or to taste
Combine broth, rice, mushrooms, water, green onions, and butter in a large pot or Dutch oven over medium-high heat. Bring to a boil. Reduce heat to medium-low. Cover and simmer for 20 minutes. Remove from heat and let stand until liquid is absorbed, about 5 minutes.