Spray a small pan with cooking spray and heat up on the stove over medium/low heat

Add sliced onion and cook until lightly browned and soft (5 to 8 minutes)

Add sugar, stir until softened

Stir in stock, cooking until sauce has a jam like consistency (add a splash of water if too dry)

Transfer onion mixture to a plate

Season chicken with the seasonings then cook throughly in the leftover sauce on the pan. About 5 minutes per side

Once chicken is cooked, top with onion mix and cheese

Cover until cheese is melted (2 minutes)