1. Cut beef
steak lengthwise in half, then crosswise into 1/4-inch thick strips.
Combine oil, garlic and pepper in large bowl. Add beef; toss to
coat.
2. Heat large
nonstick skillet over medium-high heat until hot. Add 1/2 beef
mixture; stir-fry 2 to 3 minutes or until outside surface of beef
is no longer pink. Remove from skillet. Repeat with remaining
beef. Season with salt.
3. Combine
beef with lettuce and dressing from salad mix in large bowl. Sprinkle
with croutons from mix and cheese, if desired.