Season steak, if desired. Heat 1 Tbsp. (15 mL) Becel Avo Plus™ Oil Blend in large nonstick skillet over medium-high heat and cook steak, turning once, until desired doneness. Remove steak and let sit; thinly slice.
Heat remaining 2 Tbsp. (30 mL) Oil in same skillet and cook shallots, stirring occasionally, 4 minutes. Add vinegar and broth. Reduce heat to low and simmer 5 minutes.
Toss spinach in serving bowl with dressing until slightly wilted. Top with steak. Sprinkle, if desired, with freshly ground black pepper.