For the wafer dough, wash the sweet potatoes, cut them in half and place them on a baking tray. Sprinkle the sweet potato halves with a pinch of salt and bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 30-40 minutes until the pulp of the sweet potatoes is soft. Then allow to cool briefly, scrape the flesh of the sweet potatoes from the skin and crush them in a bowl.
Grate the parmesan and add it to the sweet potatoes. Add two eggs, flour, a pinch of nutmeg and paprika powder and mix to a homogenous dough and season with salt and pepper.
Heat a waffle iron, brush with olive oil and place two tablespoons of batter on top. Close the waffle iron and wait until the waffles are crispy.
In the meantime, heat 3 tablespoons of olive oil in a frying pan, add the remaining eggs and fry over medium heat for about 2 minutes. Season with salt and pepper.
Remove the avocados from the core, peel them, cut them into slices and arrange them on 4 separate plates together with the waffles and the fried eggs. Garnish with cress as desired.