Preheat oven to broil or highest temperature.
Peel russet potato and cut into thin long wedges.
Place chicken thighs and potato wedges onto a baking tray. Season chicken thighs and potato wedges with salt, red pepper flake, black pepper, and oregano.
Coat chicken and potato wedges with olive oil, chopped garlic, and sherry wine. Mix until chicken and potatoes are evenly coated. Make sure chicken thighs are facing skin side up.
Place chicken and potatoes into the oven 10 inches away from the top heat source. Broil chicken for ~20-25 minutes or until the chicken juices run clear and potatoes are tender.