Steps
1. Season the chicken breast with salt and pepper.
2. In a skillet, melt the margarine over medium heat and cook the chicken for about 6-7 minutes on each side, or until fully cooked.
3. In the same skillet, add butter and toast the bread slices until golden brown.
4. Fry the egg in the skillet until the whites are set, and the yolk is cooked to your liking.
5. Assemble the sandwich by placing the chicken on one slice of bread, topping it with the fried egg, and closing with the other slice.