1. Heat oven to 350°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray. Microwave frozen green beans as directed on bag for maximum time; drain.
2. Meanwhile, separate each biscuit into 3 layers. Press biscuit layers in bottom and up sides of baking dish.
3. Bake 8 to 10 minutes or until set. Meanwhile, in large bowl, mix green beans, mushroom soup, 2/3 cup of the French-fried onions, and the salt and pepper. Spoon over biscuits.
4. Bake 27 to 30 minutes or until mixture is hot and bubbly. Sprinkle with remaining French-fried onions. Bake about 5 minutes longer or until onions are golden brown. Let stand 10 minutes before serving.