First, I slice the tomato and cucumber and rinse the spinach. Fresh veggies make a huge difference in flavor. I like to pat them dry to avoid soggy bread.
I scoop the avocado into a bowl and mash it with a fork. Adding a pinch of salt brings out the creamy, nutty flavor. Spread it evenly on one slice of bread.
I heat olive oil in a skillet over medium heat. Crack the egg and cook until the white is set but the yolk is still slightly runny. Season with salt and pepper.
In the same skillet, I toss the spinach quickly until just wilted. This keeps it bright green and avoids sogginess. Then I remove it and set it aside.
I layer the sautéed spinach, sliced tomato, cucumber, and cheese on top of the avocado-covered bread. Finally, I add the egg and top with the second slice of bread. A gentle press helps it all stick together.
I sometimes add a drizzle of hot sauce or a smear of mustard for an extra punch. It really elevates the flavors without overpowering the veggies.