4 strips bacon 4 bacon strips, cooked and crumbled 1/2 cup shredded cheddar cheese 1/2 cup sour cream 1/3 cup mayonnaise 2 tablespoons minced chives 1/4 teaspoon salt 1/4 teaspoon pepper 10 hard-cooked eggs, chopped 8 lettuce leaves 8 croissants, split