Cover the bottom of a 9x13 pan with biscuits; set aside. Crumble sausage into a large skillet; cook over medium heat until no longer pink. Drain; place sausage in a bowl and set aside. In the same skillet, saute mushrooms and onions in butter for 3-5 minutes, or until tender; add to sausage.
In a bowl,whisk the eggs; cook eggs over medium heat in a greased skillet, stirring until completely set.
Spread egg mixture over biscuits; sprinkle with cheese. Cover and bake at 400 for 12 minutes; uncover and bake 10-13 minutes more or until cheese melts and biscuits are golden brown.