In a small bowl, whisk together the Greek yogurt and lime juice until smooth to create the lime crema; set aside in the refrigerator.
Heat the avocado oil in a large skillet over medium-high heat and sauté the diced red onion and red bell pepper for 3-4 minutes until slightly softened.
Add the ground beef to the skillet, breaking it into small crumbles with a wooden spoon as it browns.
Season the beef mixture with chili powder, ground cumin, garlic powder, sea salt, and black pepper, stirring well to incorporate the flavors.
Once the beef is fully cooked, stir in the rinsed black beans and cook for another 2 minutes until they are heated through.
In a separate pan or microwave-safe bowl, lightly steam the cauliflower rice until tender but not mushy.
To assemble, place the cauliflower rice in the bottom of a bowl, top with the seasoned beef and bean mixture, garnish with sliced avocado, and finish with a drizzle of the lime crema.