In a small bowl, combine the oil, garlic powder and salt.
Cut each slice of bread into two pieces to form the tops and bottoms of your burger.
Brush the oil on both sides of each slice of bread.
Place a skillet over medium heat on the stove. Add the bread slices and cook for a couple minutes on each side until toasted. Set aside.
Make the bruschetta topping
Combine the diced tomatoes, oil, salt, onion, basil, black pepper and garlic in a small bowl.
Set aside until ready to serve.
Make the burgers
In a medium-sized bowl, combine the ground beef, salt and garlic using a wooden spoon or your hands.
Once combined (don't over-mix!), form into four equal-sized patties.
Heat the grill to 450°F. Add the burger patties.
Cook for 3-4 minutes and flip the burger.
Cook an additional 3 minutes on the second side, or until the burger reaches an internal temperature of 160°F for well-done.
Build the burgers
Start with a slice of the toast then layer a couple basil leaves, the burger patty, a slice of mozzarella and ⅓ c bruschetta topping. Drizzle with the balsamic glaze and top with the other slice of bread.