Fry the chicken pieces in butter for about 10 min; add salt & pepper; turn the chicken pieces over from time to time.
In the meantime chop the onion & the bacon.
Place the chicken pieces in the slow cooker.
Fry the onion & the bacon in the same pan w/o cleaning; add salt & pepper.
Add the pressed garlic.
In the meantime chop the mushrooms.
After about 10 min add the mushrooms & fry for another 10 min. Careful: nothing shall get burnt.
In the meantime chop the carrots.
Empty the pan into the slow cooker.
Add the carrots to the slow cooker.
Pour the red wine as well as the chicken stock into the slow cooker.
Add the tomato purée w/ a pinch of sugar, the dried thyme & the bay leaves.
Close the lid of the slow cooker & let it cook on high temperature for at least 5 hours.
Remove the chicken pieces - keep warm.
Remove most of the vegetables & the bacon (let’s say about 90 %!) - keep warm.
Discard the bay leaves.
Smooth the liquid w/ the rest of the vegetables using a handheld blender.
Add salt & pepper to taste.
If it’s too runny - it mostly is - bring it to a boil & add some starch solved in water.