Mix mayonnaise, Dijon, lemon juice, salt, pepper, and ¼ tsp. paprika in a medium bowl. Fold in eggs and 1 Tbsp. chives and stir to combine.
Spread on toasts, then garnish with chives and a sprinkle of paprika.
Egg salad spread, without chives, can be made 3 days ahead. Store in an airtight container and chill. Fold in chives when ready to serve.
