Preheat your oven to 400°F and line a baking sheet with parchment paper.
Peel and dice the sweet potato into half-inch cubes, then toss them on the baking sheet with olive oil, rosemary, thyme, sea salt, and black pepper.
Roast the sweet potatoes for 20-25 minutes, tossing halfway through, until they are tender and caramelized on the edges.
While the potatoes roast, whisk the whole eggs and egg whites together in a small bowl until well combined.
Heat a large non-stick skillet over medium-high heat. Add the leftover sirloin tips and sear for 2-3 minutes until heated through and a golden crust forms.
Remove the steak from the pan and lower the heat to medium-low. Pour in the egg mixture and scramble gently until fluffy and just set.
Divide the roasted sweet potatoes, seared sirloin, and scrambled eggs into a bowl.
Garnish with freshly chopped chives and sliced avocado to serve.