Cut the chicken breasts into roughly 5 pieces each.
Soak the 16 prunes in water for 5 minutes to soften, then wrap each prune with half a slice of bacon (using 8 slices total).
Thread the chicken pieces and bacon-wrapped prunes alternately onto skewers, starting and ending with chicken.
Grill the skewers on charcoal over medium-high heat for 10-12 minutes, turning every 2-3 minutes, until the chicken reaches 74°C/165°F internally.
While grilling, prepare the yogurt sauce by combining the Greek yogurt with minced garlic, finely chopped chilli pepper, roughly chopped mint, a dash of olive oil, a dash of lemon juice, and some honey.
Stir the sauce until smooth and let it rest for 5 minutes.
Serve the grilled skewers with the yogurt sauce on the side.