Toast the slices of whole-grain bread until golden brown.
Cut the avocado in half and remove the pit.
Scoop the avocado flesh into a bowl and mash with a fork.
Season the mashed avocado with salt and pepper.
Drizzle in olive oil for added flavor.
Spread the avocado mixture evenly on each slice of toasted bread.
Add desired toppings such as sliced cherry tomatoes or radishes.
Sprinkle sesame seeds on top for extra crunch.
Serve immediately and enjoy!