Preheat the oven to 300°F (150°C).
Wrap each boneless, skinless chicken breast half with one strip of bacon, securing the bacon neatly around the chicken. Continue until all eight pieces have been wrapped.
Lightly butter a large casserole dish or baking dish. Spread the roughly chopped dried beef across the bottom in an even layer.
Arrange the bacon-wrapped chicken breast halves over the dried beef, leaving sufficient space between the pieces to promote even cooking.
Combine the sour cream and condensed cream of mushroom soup in a separate mixing bowl. Stir until the two ingredients form a smooth, evenly blended sauce.
Pour the sour cream and mushroom soup mixture evenly over the arranged chicken breasts, making sure the pieces are well covered.
Season the top of the casserole lightly with freshly ground black pepper according to taste.
Transfer the casserole to the preheated oven and bake at 300°F (150°C) for approximately 2 hours, or until the chicken is thoroughly cooked and the bacon is crisp.
Remove the casserole from the oven and allow it to cool briefly before serving.