Puffed Potatoes & Sausage

Directions

1. 1
   Cook onion in butter till tender but not brown.
2. 2
   Cook potatoes in boiling salted water till tender, about 10 minutes; drain and mash (about 2 cups mashed).
3. 3
   Beat in cooked onion and cheese.
4. 4
   Beat together egg yolks, milk and salt; blend into potato mixture.
5. 5
   Fold in beaten egg whites.
6. 6
   Turn into a 2-qt.
7. 7
   casserole.
8. 8
   Arrange sausage links over potato mixture.
9. 9
   Bake, uncovered, at 375 till set, about 45 minutes.