Step 1

In a small bowl, mix the mayonnaise (1 tablespoon) and Sriracha (1/2 teaspoon) together. Set aside.

Step 2

Melt the butter (1/2 tablespoon) in a nonstick skillet over medium-high heat. Crack the egg carefully into the pan so the yolk doesn't break (see notes). Turn the heat to medium-low and cover the skillet, cooking the egg for about 2 minutes, or until whites are set and yolk is done to the desired consistency.

Step 3

Meanwhile, spread the Sriracha mayo mixture on the two slices of toasted bread.

Step 4

Using a spoon, scoop the avocado from the peel and add to one slice of bread. Use a fork to mash the avocado evenly onto the bread.

Step 5

Squeeze the lime juice (from 1 wedge) on top of the avocado and top with kosher salt to taste.

Step 6

Place the egg on top of the avocado.

Step 7

Sprinkle the cilantro (1 teaspoon) and red onion (1 teaspoon) on top of the egg. Season to taste with salt and pepper.

Step 8

Place the other piece of bread on top of the assembled sandwich.

Step 9

Eat! With a napkin- it gets messy.