Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Peel and cube the sweet potato into 1/2-inch pieces, then toss them on the baking sheet with olive oil, smoked paprika, and half of the sea salt and black pepper.
Roast the sweet potatoes for 20-25 minutes, tossing halfway through, until they are tender and slightly caramelized on the edges.
While the potatoes roast, heat a large non-stick skillet over medium-high heat.
Add the ground beef to the skillet, breaking it up with a wooden spoon or spatula.
Season the beef with garlic powder and the remaining sea salt and black pepper, cooking until browned and no longer pink.
Place the baby spinach in the bottom of a large serving bowl.
Layer the roasted sweet potatoes and cooked beef over the spinach.
Top the bowl with sliced avocado and a dollop of Greek yogurt before serving.