Hello there. If you are looking for a reliable, lighter alternative to double cream that will not split over heat, I would strongly recommend keeping a tin of evaporated milk in your pantry.
Evaporated milk is regular cow's milk that has had roughly sixty percent of its water content removed. Because it undergoes high-temperature processing during canning, the milk proteins are already stabilized, making it far less prone to curdling or splitting when exposed to pan heat or mild acids. It provides a naturally smooth, creamy texture and coats the back of a spoon beautifully, all while having significantly less fat and fewer calories than double cream.
Another very forgiving option from the dairy aisle is reduced-fat creme fraiche or light cream cheese. Creme fraiche contains cultured acidity and proteins that tolerate heat much better than Greek yogurt. If you opt for cream cheese, simply whisk a tablespoon or two directly into your warm pan juices and stock until it melts into a silky sauce.
To put this into practice for a quick dinner: sear your chicken, set it aside, and deglaze the skillet with a splash of chicken stock or white wine to lift all the browned bits. Turn the heat down to low, pour in your evaporated milk, and let it gently simmer for a couple of minutes until velvety before returning the chicken to coat. I hope this helps you create a fantastic, balanced meal tonight.