In a small bowl, combine sour cream, ½ cup parmesan cheese, garlic, oregano, salt, and pepper to make sauce.
Place chicken bottom side up on a sheet pan covered with parchment paper. Cover with half of the sauce. Flip over and cover the top with the remaining sauce and top with ½ cup parmesan cheese.
Bake chicken for 15 to 20 minutes. Cook until an internal temperature of 165°F (74°C).
Rest for 3 to 5 minutes before serving.
Notes
Salt and pepper are not included in the count for 5 ingredients recipes.