Preheat oven to 180 degrees and line a baking tray with baking paper
Use a pastry brush to flick off any dirt on your mushrooms, then remove stems and set aside (use diced in another dish).
Spread bacon and shallots on the baking paper, drizzle with olive oil, salt and pepper. Use another piece of paper to spread diced mushrooms onto and place side by side in the baking tray with the bacon and shallot mix
Place the baking tray into the oven. The diced mushroom will cook in 5 minutes, the bacon and shallots 10 mins.
Mix together olive oil and garlic salt. Use pastry brush to coat the caps of all of your mushrooms
In a mixing bowl add Parmesan cheese and whisked egg to bacon and shallots and stir to combine
Stuff mushrooms with stuffing mix
Sprinkle breadcrumb mix over mushrooms
Bake for 20 minutes or until breadcrumbs are lightly toasted