Set your oven to 400°F so it's fully hot by the time your packets are ready. Tear off four long sheets of foil and fold each one in half to make it double thick. This extra layer keeps the packets sturdy and helps stop any leaks while baking.
Put your cut potatoes in a large pot and cover them with cold water. Bring it to a boil and let them cook for about 6 minutes, just until slightly softened. Drain them, then let them cool before moving on to the next step.
Once the potatoes have cooled a bit, add the chicken pieces, chopped onion, melted butter, minced garlic, and all your dry spices into the pot. Stir everything gently so the potatoes don't break apart, making sure each piece gets an even coat of seasoning.
Pull the seasoned chicken out and set it aside for a moment. Divide the potato mixture evenly among your four foil sheets, about 1½ cups per packet, then lay three chicken strips on top of each pile. Fold the long sides of the foil up and over, then roll the edges together tightly to seal in the steam.
Place the sealed packets on a baking sheet and slide them into the oven. Bake for 30 to 35 minutes, until the potatoes are fork-tender and the chicken reaches 165°F. Since you can't peek inside, a meat thermometer is the only reliable way to check.
Carefully open each packet, keeping your face away from the steam since it's extremely hot. Drain off any extra liquid, then leave the packets open on the tray. Sprinkle Colby Jack cheese over the chicken in each one, then add the chopped bacon on top.
Slide the open packets back into the oven for 2 to 3 minutes, just until the cheese turns melty. Finish with a scattering of fresh chives, then serve right in the foil for easy cleanup or scoop everything onto a plate.