01 - Place bread slices in toaster or grill pan and toast until golden brown and crispy throughout.
02 - Halve and pit the avocado. Scoop flesh into a small bowl and mash with a fork. Add lemon juice, sea salt, black pepper, and chives. Mix until creamy but retaining some chunky texture.
03 - Heat a nonstick skillet over medium heat. Crack eggs directly into the pan. For sunny-side up with runny yolks, cook 2-3 minutes until whites are set. For firmer yolks, cook an additional 1-2 minutes or flip briefly.
04 - Divide the mashed avocado mixture evenly between the two toasted slices, spreading thickly to the edges.
05 - Place a cooked egg atop each avocado-covered toast. Sprinkle with crumbled feta cheese, red pepper flakes, and additional black pepper. Serve immediately while warm.