Preheat oven to 180°C
Line a large baking tray with baking paper
Trim stalks from mushrooms (do not discard the stalks) then place mushroom caps, gill-side up, in the baking dish. Finely chop stalks and set aside
Heat oil in a large frying pan over medium heat then add the bacon and onion and cook for about 3 minutes or until onion softens.
Add chopped mushroom stalks, stir in KNORR Chicken Stock Pot and cook for 3 to 5 minutes or until onions are golden. Add breadcrumbs and cook for 2 minutes, if the mixture is a little dry add some water to slightly moisten then remove pan from heat.
Stir in parsley, 1 teaspoon lemon rind and grated mozzarella cheese. Season with black pepper then spoon bacon mixture onto mushrooms.
Bake for 35 to 40 minutes or until golden then serve