01 -
In a large mixing bowl, whisk together the all-purpose flour, baking powder, salt, and sugar until evenly combined.
02 -
In a separate bowl, whisk the milk, vegetable oil, and egg until fully blended.
03 -
Pour the liquid mixture into the dry ingredients and stir gently until just blended; a few lumps are acceptable to prevent overmixing.
04 -
In a medium mixing bowl, combine the shredded brisket with maple syrup and Dijon mustard. Toss until the brisket is evenly coated.
05 -
Preheat the waffle iron according to the manufacturer's instructions and lightly grease with butter or nonstick spray.
06 -
Pour sufficient batter into the preheated waffle iron to just cover the surface. Close the lid and cook for about 5 minutes, or until the waffles are crisp and golden brown. Repeat with the remaining batter.
07 -
Place a cheese slice on one waffle, top with half of the brisket mixture, then another slice of cheese. Cap with a second waffle.
08 -
Heat a skillet over medium. Melt a small amount of butter. Add the assembled waffle sandwich and cook for 3–4 minutes per side until cheese is melted and exterior is golden.
09 -
Remove from skillet, slice sandwich in half, and serve warm.