Corn Casserole Recipe

Fry onion in margarine till translucent.
Add flour, salt, sry mustard and pepper and cook.
Remove from heat and add milk, return to heat & bring to a boil and continue for 1 minute.
Remove from heat and add drained corn and egg.
Place in oven safe dish that has been sprayed with Pam.
Bake at 350 for 20 - 30 minutes.