In a bowl, whisk together vinegar, Italian Seasoning, and garlic powder to hydrate. Gradually whisk in oil to emulsify.
Add Buffalo Wings Sauce and whisk to combine. Hold refrigerated until service.
Combine the flat iron steak, Grill Mates Montreal Steak Seasoning, and oil in a bowl
Toss to coat evenly and allow to marinate for a minimum of 1 hour or up to overnight.
Set grill to medium-high. For each serving, season one portion of flat iron steak with 1 teaspoon of Grill Mates Montreal Steak Seasoning. Grill until desired doneness. Remove from grill, allow to rest, and slice on bias.
In a bowl, toss 3 cups baby lettuce greens, 8 halves grape tomatoes, 1 tablepoon celery, and a 1/4 cup buffalo vinaigrette until evenly coated.
Place dressed salad on plate and top with sliced steak and 1 tablespoon blue cheese crumbles. Serve.
Crispy Chicken Tenderloins make and excellent substitute for steak in this salad.
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