In a large skillet over medium-high heat, heat olive oil. Season chicken all over with oregano, salt, and pepper. Add to skillet and cook until seared and golden on both sides, about 6 minutes.
Remove chicken from skillet and transfer to a plate. Melt butter in skillet, then add thyme, shallots, and garlic. Cook, stirring often, until shallots begin to soften, about 2 minutes. Add chicken broth and lemon slices and bring mixture to a boil.
Reduce heat to medium, and return chicken to skillet. Top chicken with brie and cover skillet with a lid. Cook until cheese has melted and chicken is completely cooked through, about 2 minutes.
Garnish with parsley and serve warm.
Recipe by The Best Video Recipes for All at https://recipes-for-all.com/brie-chicken/