Old Fashioned French Fried Onion Rings

1 egg
1 C Milk
1 T cooking oil
1 C flour
1 tsp baking powder
1/4 tsp salt
3 sweet onions
Oil for frying

Combine egg, milk and oil. Add flour, b powder and salt. Beat until smooth. Slice onions 1/4 inch think and separate rings. Coat with batter and fry until golden.