Our Favorite Mushroom Rice

Name: Our Favorite Mushroom Rice
Prep time: 20 min
Cook time: 50 min
Total time: 1 h 10 min
Cuisine: American
Ingredients: 2 cups long grain rice (uncooked); 4 ½ cups chicken broth (divided); 1 large onion (chopped); 3 ribs celery (chopped); 12 ounces mushrooms (sliced ¼-inch thick); 1 stick butter (½ cup); 2 tablespoons chopped fresh parsley; 1 ½ teaspoons poultry seasoning; ½ teaspoon salt (or to taste); ½ teaspoon black pepper (or to taste)