In a bowl, combine the cubed sweet potatoes, sliced onions, and olive oil, mixing well.
Season the mixture with kosher salt, freshly ground black pepper, and dried oregano; stir to combine and transfer to the prepared baking dish in a single layer.
Roast in the oven for 20 to 25 minutes, stirring once halfway through, until the potatoes are fork-tender.
Remove from oven and sprinkle crumbled feta cheese over the top before serving.
Notes
This sweet potato hash is a versatile side dish perfect for breakfast, brunch, or even a light dinner. Leftovers reheat well and make a great filling meal.