Put chicken in ziplock bag and combine with all of the spices and condiments.
Close ziplock bag and shake, ensuring the marinade coats each chicken thigh. Let sit.
While the chicken continues to marinate, wash the mushrooms and remove the stem. Then slice all of the mushrooms.
Heat grill pan over medium high heat. Coat the bottom of the pan with either cooking spray, coconut oil, or butter.
Once pan is heated up, place all chicken thighs onto pan along with the sliced mushrooms.
Let cook each side, approximately 5 minutes each or until outside is browned and inside is cooked through.
Turn stove to low heat or turn off. Place brie slices on top of chicken thighs and cover pan with a top. Allow cheese to soften and begin to melt, about 2 minutes.
Plate the brie topped chicken and mushrooms and dig in.
Enjoy!