Heat the avocado oil in a large skillet over medium-high heat until shimmering.
Add the ground beef to the skillet, seasoning it with sea salt, black pepper, and garlic powder.
Cook the beef for 7-8 minutes, breaking it into small crumbles with a spatula, until it is thoroughly browned and develops crispy edges.
While the beef is cooking, chop the romaine lettuce, halve the cherry tomatoes, thinly slice the red onion, and dice the cucumber.
In a small mixing bowl, whisk together the Greek yogurt, Dijon mustard, lemon juice, and smoked paprika until the sauce is smooth and combined.
Arrange the chopped romaine lettuce in a large bowl and top with the tomatoes, onion, and cucumber.
Add the crispy beef crumbles to the bowl and drizzle the zesty yogurt sauce over the top before serving.