Ingredients

10 hard-boiled egg whites 

2 hard-boiled egg yolks 

2 to 3 tablespoons light mayonnaise 

1 teaspoon Dijon mustard 

1 tablespoon freshly squeezed lemon juice 

1/2 avocado, mashed, plus 1/2 avocado roughly chopped 

Coarse salt and freshly ground pepper 

Boston lettuce, arugula, and tomato slices (optional) 

12 white sandwich bread, such as Pullman, sliced about 1/2-inch thick, toasted 

Preparation

Using a pastry blender or fork, mash together egg whites and yolks in a large bowl; carefully fold in avocado. Stir in mayonnaise, mustard, and lemon juice; season with salt and pepper.

Place 6 slices of bread on a work surface. Evenly divide egg salad among bread slices. Add lettuce greens or tomato, if desired. Top with remaining 6 slices bread. Serve.