Toast the bread slices until golden brown and crisp using a toaster or grill pan.
In a small bowl, scoop out the avocado flesh and mash with lemon juice, salt, and pepper until slightly chunky.
Spread the avocado mixture evenly across the toasted bread slices.
Top the avocado with halved cherry tomatoes and crumbled feta cheese.
Drizzle with extra virgin olive oil.
Garnish with red pepper flakes and an additional crack of black pepper if desired.
Serve immediately while the bread is still warm.