Preheat your oven to 400°F and line a baking sheet with parchment paper.
Toss the cubed sweet potatoes with half of the olive oil and a pinch of sea salt on the prepared sheet.
Roast the sweet potatoes for 20 minutes or until they are fork-tender and slightly browned on the edges.
While the potatoes roast, heat the remaining olive oil in a medium skillet over medium-high heat.
Add the ground beef to the skillet, seasoning it with garlic powder, sea salt, and black pepper.
Cook the beef for 7 to 8 minutes, breaking it into small crumbles with a spatula until it is completely browned and cooked through.
Assemble the bowl by placing a base of fresh spinach in a large bowl.
Arrange the diced cucumber, halved cherry tomatoes, and diced red bell pepper over the spinach.
Add the cooked ground beef and roasted sweet potatoes to the bowl.
Finish by sprinkling the crumbled feta cheese over the top and serve immediately.