Place chicken breasts in the bottom of a slow cooker, taking care to keep them in a single layer if possible.
Combine salt, onion powder, chives, parsley, dill, and pepper in a small bowl. Sprinkle over chicken.
Dollop yogurt evenly over chicken, then top each breast with 1 folded piece of bacon. Cook on low 6 hours. Top evenly with cheese, turn to high, and cook 20-30 minutes longer, or until cheese melts.
NOTE: If you want to brown the cheese and crisp the top, you can put each chicken breast on a sheet pan or other oven safe dish and broil it for 5-7 minutes.