Preheat waffle maker. Whisk together first 5 ingredients. In another bowl, whisk egg yolks, milk and butter. Stir into dry ingredients just until moistened. Stir in cheese.
In a separate bowl, beat egg whites until stiff but not dry. Fold into batter. Drop 1 heaping tablespoon of batter in the center of each waffle maker quadrant; bake according to manufacturer’s directions until golden brown, about 5 minutes. Cool on wire rack. Repeat with remaining batter.
Spread mayonnaise evenly over half the waffle pieces; top with bacon, tomatoes, lettuce, seasonings and remaining waffle pieces to make sliders. Serve immediately.
