Start by seasoning the flank steak generously with salt and pepper.

Preheat your grill or skillet over medium-high heat.

Place the steak on the grill or skillet and cook for about 5-6 minutes per side for medium-rare.

Remove the steak from heat and let it rest for at least 5 minutes.

Once rested, slice the steak against the grain into thin strips.

In a large mixing bowl, combine the salad greens, cherry tomatoes, avocado, and red onion. Toss gently to combine.

Top the salad with the sliced steak and crumbled blue cheese.

Drizzle the balsamic vinaigrette over the salad and toss lightly.