Preheat oven to 400°F (200°C). Generously coat large baking sheet with cooking spray and place waffles in single layer.
In glass measuring cup, whisk together eggs and pepper; pour evenly over each waffle, spreading to fill cavities. Bake for about 15 minutes or until egg is set and waffles are crisp.
Maple-Mustard Mayo: Meanwhile, in small bowl, combine mayonnaise, maple syrup and mustard; set aside.
Top 4 waffles evenly with tomato, bacon and cheese. Return to oven until cheese melts, about 1 minute. Top cheese with salad greens and drizzle with maple-mustard mayo. Top with remaining 4 waffles, egg side down. Serve immediately with additional maple-mustard mayo, if desired.
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