1. 1. Boil the eggs until hard-boiled, then peel and chop them.

2. 2. In a bowl, mix the chopped eggs with mayonnaise and light sour cream.

3. 3. Add finely chopped red onion to the egg mixture and combine well.

4. 4. Toast the bread slices until golden brown.

5. 5. Spread the egg salad mixture on one slice of bread and top with another slice to create a sandwich.

6. 6. Cut the sandwich in half diagonally and serve.