Grease and preheat a waffle iron on medium heat. In a small bowl, whisk together club soda, egg and butter. To make the batter, put Baking & Pancake Mix in a separate medium bowl and slowly stir in the egg mixture. The batter will be a little lumpy. Add bacon to the batter and mix until combined. Let batter rest for three minutes. Bake until golden brown, about 2 to 3 minutes on medium, or according to waffle iron manufacturer’s instructions. Serve immediately, topped with chopped pecans, if desired. Waffles may also be kept crisp and warm by placing them in a single layer on a wire rack in a preheated 200°F oven until ready to serve.