- Preheat the oven to 350°F (175°C). 
- In a large skillet over medium heat, add butter and olive oil. Once the butter has melted, sauté garlic and pancetta until it is lightly browned. 
- Add onions and mushrooms to the pan and continue cooking for a few more minutes. 
- Place chicken thighs into the skillet and pour in Riesling. Bring to a boil and reduce heat to low. Simmer for about 20 minutes until the chicken is cooked through and the sauce has reduced slightly. 
- Add the cream and let it simmer for another 5 minutes, stirring occasionally. 
- Season the dish with pepper and salt to taste. 
- Place the chicken in a baking dish and pour over the sauce from the skillet. 
- Bake in preheated oven for 20 minutes, or until golden brown on top. 
- Serve hot with your favorite side dishes.