Line a baking sheet with a silicone mat or place a baking stone into preheating oven.
Brush the toasts with the olive oil and bake for 5 minutes, until coated and crispy.
While the toasts are baking, mix together the tomatoes, avocados and mozzarella pearls.
Remove the toasts from the oven and top each with the topping.
Drizzle balsamic reduction over it and garnish with basil.
In a pot over medium high heat, heat all the ingredients and stir. Watch carefully - the glaze should begin to thicken after 5 minutes and you want it thick enough to stick to the back of a spoon, but not to thicken into a glob. It becomes very thick very quickly so watch carefully.
Once glaze has thickened, remove from heat. Drizzle over the bruschetta.