Using a large sauce pot, add bacon, once bacon starts to brown add onions & cook for roughly 5 minutes.
Careful not to burn the bacon, add soup. Simmer on low for about 15 minutes.
Transfer to large mixing bowl, add 1 cup of cheese, 1.5 cups of panko, mix thoroughly.
Fold in the chives, sour cream, Black Pepper & chicken.
Place mixture in baking dish and bake in 350 degree oven for 20 minutes.
Top with remaining cheese and panko, bake until golden brown, about 5 minutes.