Lay a slice of prosciutto on the board and place a rolled chicken thigh at one end. Roll to enclose the thigh in the prosciutto. Repeat with the remaining prosciutto and chicken pieces.
Heat a splash of olive oil in a large frying pan over medium-high heat. Brown the chicken parcels on all sides until golden brown, remove from pan and set aside.
Add the garlic to the frying pan and sauté until fragrant. Add the potatoes and gently toss to coat with the garlic. Pour over the cream, stock and wholegrain mustard and bring to a simmer for 10 minutes.
If using an oven-proof pan leave the potatoes in the pan, or alternatively transfer them to an oven-proof dish. Place the chicken parcels back on top of the potatoes and place in the oven to bake for 30 minutes until golden and bubbling. Leave to rest for 5 minutes before serving with a sprinkle of fresh oregano.
Tips for Chicken Thighs with Oregano and Prosciutto: