Preheat oven to 375 degrees.
Beat eggs & add 1/2 cup of the milk. Gradually add the milk, flour and salt. Beat until thick & smooth.
Melt the margarine in a glass bowl and pour into your 9 X 13 pan. Pour the batter over the melted margarine.
Bake at 375 for one hour. Sprinkle sugar & cinnamon on top when it comes out of the oven. It will be very "puffy" when you take it out of the oven and it will "cave in" after awhile....but it is supposed to do that. Serve with jam, syrup, honey, berries ... you can use your imagination what to put on top. Yum.