3 tablespoons butter, plus extra for casserole dish
2 tablespoons all-purpose flour
1/2 pound shiitake or baby bella mushrooms, sliced
1/4 cup onions, chopped
2 cloves garlic, finely chopped
1/2 teaspoon garlic powder
1/2 teaspoon cayenne pepper
1 1/2 cups heavy cream
1/2 cup chicken stock
1 (10-ounce) box frozen chopped broccoli, thawed and drained
2 cups shredded Cheddar-Monterey blend
3 cups cooked rice
Salt and freshly ground black pepper
Special equipment: 1 1/8-quart oval casserole dish