Heat avocado oil in a large cast-iron skillet over medium-high heat until shimmering.
Add the ground beef to the skillet, breaking it into large chunks with a wooden spoon, and let it sear undisturbed for 4 minutes to develop a crispy, golden crust.
Break the beef into smaller crumbles and stir in the sea salt, black pepper, chili powder, cumin, and garlic powder until well combined.
Continue cooking for another 3 minutes until the beef is fully browned and the edges are slightly crunchy.
In a wide bowl, layer the shredded romaine lettuce and the black beans as a base.
Spoon the crispy beef over the lettuce and beans, then top with diced tomatoes, sliced radishes, and fresh avocado.
Finish the bowl with a dollop of fresh salsa and serve immediately.