Preheat the oven to 375°F (190°C) and grease a baking dish.
Cook the ground beef in a skillet over medium heat until browned, then drain excess fat.
Stir in taco seasoning, salsa, and green onions, then transfer to the baking dish.
In a bowl, whisk eggs, heavy cream, and sea salt until well combined.
Pour the egg mixture over the beef and top with half of the shredded cheese.
Bake for 25-30 minutes until set and golden on top.
Sprinkle the remaining cheese on top and let it melt while resting for 5 minutes.
Slice and serve warm with your favorite toppings!