Heat a skillet coated in cooking spray over medium-low and turn the broiler on in your oven. Crack an egg into a bowl, add the milk, and whisk until well blended; season with sea salt and freshly cracked pepper, to taste. Pour the egg mixture into the skillet and swirl so the pan is evenly coated with the egg.
Once your egg is starting to set, remove it from the heat and sprinkle with the ground beef mixture, tomatoes, avocado, green onion, olives, and shredded cheese.
Move the skillet to the oven and place it on the top rack (don’t put the handle in the oven if it’s not oven safe) and let the broiler cook the top part of the egg, it takes only 20-30 seconds or so.
Remove the pan and flip the other part of the egg mixture on top of the ground beef mixture. Slide onto a plate and serve immediately with salsa on the side if desired. Enjoy.