Mix saltines with the melted margarine. Press into 9" pie plate.
Sauté onions in 2 tablespoons margarine until tender but not brown. Drain onions on paper towels to remove moister. Pour into crumb crust. Mix remaining ingredients and pour over onions.
Bake at 350 degrees for 20-30 minutes or until a knife inserted in the center comes out clean.
Recipe Tips
If you can't find Vidalia onions you can use the following: