Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Peel and dice the sweet potato into small half-inch cubes, then toss them on the baking sheet with 0.25 teaspoons of olive oil, rosemary, thyme, sea salt, and black pepper.
Roast the sweet potatoes for 15-20 minutes, tossing once halfway through, until they are tender and slightly caramelized on the edges.
While the potatoes roast, heat a non-stick skillet over medium-high heat with the remaining 0.25 teaspoons of olive oil and sear the sirloin steak for 3-4 minutes per side for medium-rare.
Remove the steak from the pan and let it rest for 5 minutes before slicing it into thin, bite-sized strips.
Lower the skillet heat to medium-low and pour in the egg whites, scrambling them gently with a spatula until they are fluffy and just set.
Assemble your breakfast bowl by combining the roasted sweet potatoes, sliced sirloin, and scrambled egg whites, then garnish with freshly chopped chives to serve.