Cheesy Mushroom and Broccoli Casserole

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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