Toast the sourdough slice until golden-brown and crisp. You can use a toaster or a hot pan with olive oil.

In a small bowl, combine the avocado flesh, lemon juice, salt, and pepper. Gently smash with a fork to your desired consistency.

Cook the egg to your preference. For fried: cook in a non-stick skillet over medium-low heat for 2-3 minutes until the white is set. For poached: simmer in water with a splash of vinegar for 3 minutes.

Spread the smashed avocado over the warm toast. Top with the cooked egg. Garnish with more salt, pepper, and a pinch of red pepper flakes if using.

Serve immediately for the best taste and texture.