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.
Add lemon juice, salt, and pepper to the avocado.
Mash the avocado mixture with a fork until creamy.
Spread the avocado mixture evenly on each slice of toast.
Top with your choice of toppings.
Drizzle with additional lemon juice or olive oil if desired.
Season with more salt and pepper if desired.
Serve immediately and enjoy your delicious avocado toast!