Season the steak: Rub steaks with olive oil, salt, pepper, and garlic powder.
Cook the steak: Heat a pan or grill over medium-high heat. Cook steaks for 4–6 minutes per side, depending on thickness and desired doneness.
Rest the steak: Remove from heat and let rest for 5 minutes to retain juices.
Slice the steak:Cut thin slices against the grain for tenderness.
Prepare the salad base :Add mixed greens, cherry tomatoes, cucumber, and red onion to a large bowl.
Assemble the salad: Top with sliced steak, blue cheese, and nuts if using.
Make the dressing: Whisk olive oil, vinegar, mustard, salt, and pepper.
Serve: Drizzle dressing over the salad and toss lightly before serving.