Melt the butter in a small saucepan, then let it cool to room temperature.
In a large bowl, whisk together the flour, baking powder, salt, and sugar. This ensures the dry ingredients are evenly distributed.
In another bowl, whisk the eggs, then add the melted butter, vanilla extract, and milk. Stir until smooth to create a homogenous batter.
Gradually pour the wet ingredients into the dry ingredients, while constantly stirring. Be careful not to overmix, as this can make the waffles tough!
Preheat your waffle iron and lightly grease it with butter or oil to prevent the batter from sticking.
Pour a portion of the batter into the waffle iron, then cook until golden brown, about 3-5 minutes. The time may vary depending on the iron's performance.
Remove the cooked waffle and let it cool slightly on a wire rack to keep it crispy.
Grill or pan-fry the beef patties over medium heat for 3-4 minutes on each side, until cooked through.
Fry the bacon slices in a skillet until crispy, then drain excess grease with paper towels.
Slice the tomato into thin slices and prepare the lettuce leaves.
Spread a little mayonnaise and mustard on one waffle, then place a beef patty, a slice of cheddar, bacon, tomato, and lettuce on top.
Top with another waffle to complete the sandwich, and serve immediately.
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