Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Peel and cube the sweet potato into half-inch pieces and trim the woody ends off the asparagus.
Toss the sweet potatoes and asparagus with the olive oil, half the sea salt, and half the black pepper on the prepared baking sheet.
Roast the vegetables for 20 minutes, or until the sweet potatoes are fork-tender and the asparagus is slightly charred.
While the vegetables roast, place a non-stick skillet over medium-high heat and add the ground turkey.
Cook the turkey, breaking it up with a spatula, until it is browned and cooked through.
Season the turkey with the remaining salt, pepper, dried oregano, and garlic powder, stirring well to incorporate.
Warm the pre-cooked brown rice and portion it into a serving bowl.
Layer the roasted sweet potatoes, asparagus, and seasoned turkey over the rice.
Top the bowl with fresh diced cucumber and a dollop of Greek yogurt before serving.