Generously season the chicken with salt, pepper, Cajun and Italian seasonings. Do not slice it yet – you will be cooking it whole.
Heat a large skillet over medium high heat.
When the pan is hot, add the butter.
When the butter is just melted, add the chicken breasts and cook for about 4-5 minutes on each side until browned for a total of 8-10 minutes.
Remove chicken onto a plate and allow it to rest for 5-10 minutes.
Add the sliced sausage pieces to the skillet and brown them on medium heat for 2-3 minutes on each side.
Remove the sausage from the skillet onto a plate.
Deglaze the pan with a splash of water.
Add the second tablespoon of butter and the sliced mushrooms into the skillet (add more butter as well, if needed). Saute until your mushrooms should look nice and moist, and dark. Once cooked, remove them from the pan as well.