In a 10-in. ovenproof skillet, cook sausage over medium heat until no longer pink; drain and set aside. In the same skillet, cook apples and brown sugar in butter over medium heat until apples are tender.
In a blender, combine the eggs, milk, flour, sugar and salt; cover and process for 10 seconds or until smooth. Pour over apple mixture. Sprinkle with sausage and cheese.
Bake, uncovered, at 425° for 18-23 minutes or until pancake is puffy and golden brown. Cut into wedges. Serve with sour cream and syrup if desired.