To prepare croutons, arrange bread cubes on a baking sheet. Lightly coat bread cubes with cooking spray.
Sprinkle evenly with lemon pepper and garlic powder; toss to coat.
Bake at 350 for 10 minutes or until crisp, stirring once.
To prepare salad, combine arugula, radicchio, and escarole in a large bowl.
To prepare vinaigrette, heat oil in a nonstick skillet over medium heat.
Add shallots and garlic; cook 5 minutes, stirring occasionally.
Add tomato; cook 2 minutes, stirring frequently. Stir in vinegar, sugar, mustard, salt, and black pepper. Reduce heat to low; cook 2 minutes or until warm.
Drizzle warm vinaigrette over salad; toss gently to coat.
Place 1 cup salad on each of 9 salad plates; top each serving with about 2 1/2 teaspoons cheese. Divide croutons evenly among salads.