Spray bottom and sides of 13x9-inch (3-quart) glass baking dish with cooking spray, or grease with shortening.
In 12-inch skillet, cook sausage, apples and onion over medium-high heat 8 to 10 minutes, stirring frequently, until sausage is no longer pink; drain if necessary.
Spoon into baking dish.
In medium bowl, beat eggs and ½ teaspoon of the salt with whisk or fork until well mixed.
Pour eggs over sausage mixture.
In large bowl, mix flour, baking powder, sugar, baking soda and remaining 1 teaspoon salt.
Using pastry blender or fork, cut in butter until mixture looks like coarse crumbs.
Stir in cheese and green onions.
Add buttermilk; stir just until combined.
Drop dough by rounded tablespoonfuls evenly onto sausage mixture.
Bake uncovered 20 to 30 minutes or until biscuits are deep golden brown and done in center.