Preheat Belgian waffle iron according to manufacturer's directions.
Sift flour, salt and baking powder and set aside in a bowl.
In another bowl, whisk sugar in egg yolks until the sugar dissolves and the eggs are pale yellow.
Whisk in the melted butter, milk and vanilla extract.
Mix in the flour mixture, whisking all along but without overmixing.
In another bowl, beat egg whites for about a minute (with electric mixer) until they form stiff peaks.
Fold in egg white to waffle batter.
Coat the waffle iron with cooking spray and pour in batter to just cover the grid.
Cook for about 2 minutes to 3 minutes until golden brown.
Serve waffles with the candied bacon and maple syrup.