Roast Chicken & Creamy Garlic Mushroom Burger

brioche burger rolls (if you want to make them yourself, the recipe is here)

olive oil

medium mushrooms (chestnut or mini portabella are good, sliced)

good pinch of salt and pepper

rashers of streaky bacon (smoked or unsmoked - depending on your preference, cut in half widthways)

garlic (peeled and minced)

double/full fat cream

strong cheddar cheese (grated)

large handful of baby spinach leaves (about 25g)

large (well seasoned, roasted chicken breasts, sliced (skin left on) - I like to roast a whole chicken and use the breasts for this, and then the rest of the meat for soup like this)