In a small bowl, combine the ground turkey with dried sage, garlic powder, sea salt, and black pepper to create a clean, sugar-free sausage blend.
Scrub the Yukon gold potato and dice into uniform 1/2-inch cubes, leaving the skin on for extra fiber and texture.
Heat the avocado oil in a large cast-iron or non-stick skillet over medium-high heat.
Add the diced potatoes to the hot skillet, spreading them in a single layer to ensure they develop a crispy golden-brown crust, cooking for about 8-10 minutes.
Push the potatoes to the edges of the pan and add the turkey sausage mixture and diced yellow onion to the center.
Break the turkey apart with a wooden spoon and sauté until the meat is thoroughly browned and the onions are translucent.
Stir in the diced red bell pepper and cook for an additional 3 minutes until the vegetables are tender-crisp.
Create a small well in the center of the hash, crack the egg into it, and cover the skillet with a lid for 2 minutes until the egg white is opaque but the yolk remains runny.
Finish the dish with a sprinkle of fresh chopped parsley before serving warm directly from the skillet.