Rub the Carne Asada seasoning all over steak and cover. Refrigerate for 20-30 minutes.
Heat a large skillet to medium-high heat. Spray lightly with cooking spray or olive oil. Add the sirloin steak. Flip steak after 3 minutes. Cook for another 3 minutes on the other side.
While the steak cooks, prepare the rest of the salads. Dice the bell pepper, avocado and cut cherry tomatoes in half. Tip: make the salad you'll be eating for this meal on a small plate and divide all other ingredients into several food containers for leftovers! Keep dressing separate.
Once steak is ready, move to a cutting board and slice against the grain. Serve on top of salads. Place dressing on the side and use the "dip fork method" to get only a bit of dressing per bite.