Preheat your oven to 425°F for roasting the broccoli.
Toss the broccoli florets lightly with half the olive oil, a pinch of salt, and black pepper. Spread them on a baking sheet in a single layer.
Roast the broccoli in the oven for 15-18 minutes, stirring halfway through, until they are crispy on the edges.
Meanwhile, pat the sirloin steak dry with paper towels. Season both sides with salt and black pepper.
Mince the garlic clove and roughly chop the fresh rosemary and thyme. Rub half of the garlic and herbs onto the steak.
Heat the remaining olive oil in a heavy skillet over medium-high heat. When the oil is shimmering, add the steak.
Sear the steak for about 3-4 minutes on each side, or until it reaches your desired doneness. In the last minute of cooking, sprinkle the remaining garlic and herbs over the steak.
Remove the steak from the pan and let it rest for a few minutes.
Plate the steak alongside the crispy roasted broccoli and serve immediately.