Scrub the russet potato and dice into small, uniform 1/2-inch cubes to ensure they cook quickly and evenly.
Heat the avocado oil in a large cast-iron or non-stick skillet over medium-high heat until shimmering.
Add the diced potatoes to the skillet in a single layer and cook undisturbed for 5 minutes to develop a golden-brown crust.
Stir the potatoes and add the diced onion and red bell pepper, cooking for another 4 minutes until the vegetables begin to soften.
Push the vegetables to the edges of the pan and add the ground beef to the center, breaking it up with a spatula.
Season the entire pan with sea salt, black pepper, garlic powder, and smoked paprika.
Cook the beef for 5-6 minutes, stirring occasionally, until it is fully browned and the potatoes are fork-tender and crispy.
Remove from heat and garnish with freshly chopped parsley before serving.