Heat a skillet or grill pan over medium-high heat for 2 minutes. Brush both sides of each bread slice with olive oil (or spread butter on one side if using for richer flavor).

Toast the bread

Place bread in the hot skillet and toast 2–3 minutes per side, or until golden brown and crisp. Alternatively, toast in a toaster to your preferred doneness. Set toasted bread aside on a plate.

Avocado mash

Cut the avocado in half lengthwise, remove the pit, and scoop flesh into a medium bowl.

Using a fork, mash the avocado to your preferred texture: leave it slightly chunky or mash smooth.

Add the lemon juice, fine sea salt, and half of the black pepper. Stir to combine and taste; adjust salt, pepper, or lemon as desired. If you like heat, fold in red pepper flakes.

Assemble and garnish

Divide the avocado mash evenly between the two toasted bread slices, spreading it to the edges.

Top with optional additions: arrange halved cherry tomatoes and microgreens or arugula. If using an egg, place the soft-boiled or fried egg on top.

Finish with remaining black pepper, a light sprinkle of everything bagel seasoning or toasted sesame seeds, and a small drizzle (about 1/2 tsp) of olive oil if desired. Serve immediately.