Dice the chicken breast and sweet potato into small, uniform cubes to ensure even cooking.
Heat olive oil in a large non-stick skillet over medium-high heat.
Add the sweet potato cubes to the skillet and sauté for 8-10 minutes until they begin to soften and develop a golden-brown crust.
Push the potatoes to the side and add the diced chicken, seasoning everything with sea salt, black pepper, and garlic powder.
Cook for another 5-7 minutes, stirring occasionally, until the chicken is cooked through and the potatoes are tender.
While the hash finishes, toast the sourdough bread until crisp.
In a separate small non-stick pan, fry the egg to your preference, ideally leaving the yolk runny to create a natural sauce.
Plate the hash, top with the fried egg, a dollop of lactose-free yogurt, and fresh parsley, then serve with the toasted sourdough on the side.