Place the chicken in the slow cooker and sprinkle ranch seasoning on top. Add the cream cheese block and cook until the chicken becomes tender—about 2.5 to 3 hours on high or 4 to 5 hours on low. Shred the chicken in the slow cooker and mix in cheddar and bacon until creamy.
Wash and dry the russet potatoes, then rub each with a thin layer of olive oil and a sprinkle of salt and pepper. Bake them at 425°F (220°C) for 45–60 minutes until soft inside. Let them cool slightly so they’re easy to handle.
Slice each potato across the top and gently squeeze the sides to open it up. Fluff the inside with a fork and season lightly. Spoon a generous amount of crack chicken filling inside each potato, then top with cheddar and extra bacon.
Broil the stuffed potatoes for about 5 minutes until the cheese is melted and golden. Garnish with green onions, chives, or a drizzle of ranch dressing. Let them rest a few minutes before serving.