Roll each bit of mince into a ball and flatten slightly using the heel of your hand.
Slam the patties onto a hot skillet with a bit of force, so they spread slightly on contact with the heat, turning every minute until cooked how you prefer (for a medium - approximately 6 to 7 minutes overall).
Slice the burger buns and warm through slightly on the griddle (until the sliced side is golden).
Lay a few leaves of baby spinach on the bottom of the burger bun.
Place the slice of tomato next.
Add the cooked slider on the top, followed by the bacon and the brie.
Place the top of the burger bun onto the burger and serve.