Preheat oven to 350(F). Cook the minute rice according to package directions. Meanwhile, in large sauce pan cook the onions in 3 tablespoons of the butter until tender. Add the soup, broccoli, cheese and enough milk to make it the desired consistency. I estimated I used about a cup, maybe a little more. Stir together carefully and let cook slightly at least until broccoli is nicely thawed and the cheese begins to melt. Stir in the cooked rice. Turn into a buttered 9x13 pan. Melt the rest of butter. Add enough bread crumbs to make a nice crumb topping; add about a quarter teaspoon of salt and a dash of pepper, to taste, to the crumb mixture. Bake the casserole for 30 mins, add the crumb topping, then bake another 15 minutes.