Defrost the frozen beans in the microwave.
Place the mushroom soup, milk and pepper in a 1 1/2-quart casserole dish.
Stir in beans and 2/3 cup of the fried onions.
Reserve the rest for later.
Bake for about 20 to 25 minutes at 350F.
Then top with the remaining 2/3 cup fried onions and bake about 5 more minutes, until onions are lightly browned.
Options: You can add more French fried onions, if you love them, but remember, they're pretty fattening! ;)