Preheat your grill to medium-high heat, or 400° F.
Prepare the bruschetta by adding the tomatoes, garlic and basil to a bowl. Gently stir, drizzle the olive oil a little at a time into the mixture and season to taste with salt and pepper. Cover and allow to chill in the fridge for 30 minutes while you prepare the burgers.
Season the ground beef with onion, garlic powder, thyme, salt and pepper. Press the ground beef into 4 patties. Grill the patties for 4 minutes on either side.
Gently rub each side of the ciabatta buns with a garlic clove and brush a light layer of olive oil. Season lightly with salt and pepper. While the burgers are finishing cooking, gently toast the ciabatta buns on the grill.
Before taking the patties off the grill, add the thick slices of cheese and allow it to melt slightly.
Build the burgers by adding a few basil leave to the bottom of the bun, top with patty, a spoonful of fresh bruschetta, a drizzle of balsamic glaze and top with the other half of the bun.