Turn oven to bake at 375ºF to preheat. Dice onions and mushrooms into small bite sized pieces.

Heat a pan over medium heat to melt half your butter then add your minced garlic. Fry for a couple of minutes then add the onion.

Sautee onions until they are translucent then add your diced mushrooms to the pan.

Cook down for approximately 20 minutes until well caramelized and browned.

Add cream cheese and mix through the vegetables until melted.

Add the three cheeses to the pan and allow to melt while mixing into the mixture.

Once the cheese has melted, add the spinach and allow this to wilt and combine with the stuffing mix well. Once done, remove from heat and allow to cool briefly.

Ensure you have already prepared your beef if you need to. Lay your prosciutto (or bacon) flat on a chopping board overlapping itself slightly and place the beef schnitzel over the top.

Evenly spread your stuffing mixture onto the beef so it covers the schnitzel. Leave the edges free to prevent stuffing from spilling over the edges.

Roll your stuffed beef up using the bacon or prosciutto. If you need to, secure with toothpicks.

Melt remaining butter in a pan over medium heat and place your beef roll in the pan to brown. Keep turning until evenly browned then remove and place into your preheated oven.

Cook for approximately 15-20 minutes until beef has cooked through.