1 tablespoon vegetable oil
2 ounces flank steak, cut diagonally across the grain into thin slices
1 red bell pepper, cut into thin strips
1 small white onion, sliced into thin strips
1 yellow bell pepper, cut into thin strips
3 tablespoons lower-sodium soy sauce
1 1/2 tablespoons rice wine vinegar
1 tablespoon fresh ginger, peeled and minced
2 teaspoons chili garlic sauce
4 green onions, thinly sliced
Heat a large nonstick skillet over medium-high heat. Add oil to pan; swirl to coat. Add steak to pan; cook 2 minutes, searing on one side. Add bell peppers and onions; cook 2 minutes or until beef loses its pink color, stirring constantly. Remove beef mixture from pan.
Add soy sauce, vinegar, ginger, and chili garlic sauce to pan; bring to a boil. Cook 1 minute or until slightly thickened. Add beef mixture and green onions back into pan; toss well to coat. Serve immediately.