1Preheat oven to 350 degrees F (175 degrees C). Lightly butter an 8x8 inch baking pan.
2Line bottom of pan with bread cubes. In a large bowl, beat together eggs, milk, 2 tablespoons sugar, salt and vanilla. pour egg mixture over bread. Dot with margarine; let stand for 10 minutes.
3Combine remaining 2 tablespoons sugar with 1 teaspoon cinnamon and sprinkle over the top. Bake in preheated oven about 45 to 50 minutes, until top is golden.
4Note: you can use any kind of bread, however when I use regular sandwich bread, I add 1/3 cup bisquick (or baking mix) to my liquid mixture.