Preheat your oven to 400°F 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, sea salt, black pepper, garlic powder, and smoked paprika.
Roast the sweet potatoes for 20-22 minutes, tossing halfway through, until they are tender and caramelized on the edges.
While the potatoes roast, heat a large skillet over medium-high heat and add the ground beef, breaking it apart with a spatula.
Cook the beef until browned and fully cooked through, then add the diced red bell peppers to the skillet and sauté for 3 minutes.
Add the fresh spinach to the beef mixture and stir for 1 minute until the leaves are just wilted.
Assemble the bowls by placing the roasted sweet potatoes at the bottom and topping them with the savory beef and vegetable mixture.