In a skillet over Medium High heat add 1tbsp oil and cook the chicken cutlets 5 min per side or until internal temperature reaches 165F. Remove from pan and set aside.
In the same pan reduce heat to Medium and add another 1 tbsp olive oil if needed. Add onions and cook stirring frequently about three minutes.
Add garlic and herbs and stir continuously for about one minute.
Add tomatoes and sugar, and salt and pepper the mixture to taste.
Allow tomato mixture to cook down about 2 minutes until tomatoes just start to soften.
Turn the oven on broil and place the top rack close to the top.
On a sheet tray assemble chicken with a piece of mozzarella and a spoonful of tomato mixture on top.