1. Preheat oven to 375°.
2. Combine first 6 ingredients in a small bowl; stir in 2 minced garlic cloves. Add bell pepper strips; toss well, and set aside.
3. Heat a medium nonstick skillet over medium-high heat. Sprinkle steaks evenly with salt and black pepper; coat steaks with cooking spray. Add steaks to pan; cook 6 minutes on each side or until medium-rare or desired degree of doneness. Remove from pan; let stand 10 minutes.
4. While steaks stand, combine bread cubes and remaining minced garlic; toss well. Spread bread cubes in a single layer on a baking sheet coated with cooking spray. Bake at 375° for 8 minutes or until golden brown.
5. While bread bakes, place about 1 1/2 cups arugula on each of 4 plates. Cut steaks diagonally across grain into thin slices. Remove bell pepper from bowl with a slotted spoon, reserving marinade. Divide steak and bell pepper evenly among salads. Drizzle reserved marinade evenly over each salad; top each salad with 1/4 cup croutons.