Instructions:
*Step 1: Make the Egg Salad*
1. In a medium bowl, combine chopped eggs, mayonnaise, Dijon mustard, lemon juice, and chopped chives.
2. Mix well until all the ingredients are fully incorporated.
3. Season with salt and pepper to taste.
*Step 2: Assemble the Sandwich*
1. Lay out the slices of bread on a clean surface.
2. Spread a layer of egg salad on each slice of bread.
3. Add lettuce, tomato, and/or spinach if desired.
4. Top with another slice of bread to complete the sandwich.
*Step 3: Serve and Enjoy!*
1. Cut the sandwiches in half or into quarters.
2. Serve immediately and enjoy!