To make the guacamole, mash the avocado in a bowl with a fork and add in the juice of a lime.
Season with salt and pepper to taste and leave it aside.
Next, heat a pan on a medium heat and spray with 1kcal spray.
Add the garlic and onion and fry for 2-3 minutes to soften them.
Meanwhile, cook the eggs any way you like - fried, poached, scrambled etc.
Add the Mexican spice, corn kernels and black beans to the onion and garlic mixture and cook for another 2 minutes to heat everything up.
Toast the sourdough.
Serve the spicy mixture over the sourdough toast with the cooked eggs and top with your home made guacamole.