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Whisk eggs in a large bowl until smooth. Stir in cheese, crumbled bacon and pepper.
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Preheat a 7-inch round waffle iron (not Belgian); coat with cooking spray. Pour about 2/3 cup of the egg mixture into the hot waffle iron. Cook until the eggs are set and light golden brown, 4 to 5 minutes. Repeat the procedure with cooking spray and the remaining egg mixture (making 4 chaffles total).
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Slice each chaffle into quarters. Top half of the quarters evenly with avocado slices, tomato slices and lettuce. Top with the remaining chaffle quarters (making 8 sandwiches). Serve immediately.
Tips
Equipment: 7-inch round waffle iron (not Belgian)