Preheat your oven to 400°F and line a baking sheet with parchment paper.
Toss the broccoli florets with one teaspoon of avocado oil and a pinch of salt, then spread them on the baking sheet and roast for 20 minutes until the edges are crispy.
Peel and cube the sweet potato, then boil in a pot of water for 10-12 minutes until fork-tender.
Drain the sweet potatoes and mash them thoroughly, adding a splash of hot water if needed to reach a creamy consistency.
Season the sirloin steak with garlic powder, salt, and pepper.
Heat the remaining teaspoon of avocado oil in a cast-iron skillet over medium-high heat.
Sear the steak for 3-4 minutes per side for medium-rare, or until it reaches your desired level of doneness.
Remove the steak from the pan and let it rest for 5 minutes before slicing against the grain.
Plate the sliced beef alongside the sweet potato mash and roasted broccoli.