Season chicken thighs with salt and pepper.
In a large cast iron skillet, or black pot, melt butter over medium-high heat.
After butter is melted and golden brown, add the olive oil.
Add chicken thighs to the pan, skin side down.
After the skin is golden brown, flip the thighs and cook for another 7-10 minutes
Once the chicken is browned, remove from the pan and add the onion.
Once onions turn translucent, add the mushrooms.
Cook the onions and mushroom until mushrooms have cooked down and are soft
Add the garlic to the mixture and cook for 2 minutes - you do not want to burn the garlic
Add the flour and mix for 1-2 minutes
Add the milk and stir until slightly thickened.
Add the chicken back into the pot and reduce the heat to low. Let simmer for about 10 minutes
Serve over rice or noodles