Preheat your oven to 400°F and line a baking sheet with parchment paper.
Halve the baby potatoes and trim the woody ends off the asparagus.
Toss the potatoes with a pinch of salt and pepper, then roast for 12 minutes.
Add the asparagus to the baking sheet and roast for an additional 8-10 minutes until both vegetables are tender.
While vegetables roast, finely mince the parsley, cilantro, and garlic.
In a small bowl, whisk together the minced herbs, garlic, extra virgin olive oil, red wine vinegar, and red pepper flakes to create the chimichurri.
Pat the flank steak dry and season both sides with the remaining salt and pepper.
Heat avocado oil in a cast-iron skillet over medium-high heat until shimmering.
Sear the steak for 4-5 minutes per side for medium-rare, then transfer to a cutting board to rest for 5 minutes.
Slice the steak against the grain and serve topped with the fresh chimichurri and roasted vegetables.