Rub salt and pepper on both sides of chicken.
Heat oil in a skillet over medium heat. Add chicken and sear until browned and cooked though, about 3-4 minutes per side. Transfer out of pan, reserving juices.
Add mushrooms to the same pan and cook until softened, about 4-5 minutes.
Add garlic and cook until fragrant, stirring occasionally, about 30 seconds.
Add cream and stir to combine. Reduce heat to medium-low and and simmer until thickened, about 8-10 minutes, stirring occasionally.
Add parmesan and stir to combine. Season to taste with salt and pepper.
Add chicken and stir to combine.
