Pre-heat the oven to 350.

Place the ground beef in a skillet and bring over medium heat. Cook, using a wooden spoon to break up the beef into small pieces, until the meat is browned and cooked through. Add the corn kernels and stir together. Cook for another minute. Add the water and taco seasoning and stir together until well combined. Remove from heat and set aside.

When the oven is pre-heated, place the flatbread directly onto the middle rack and bake for about 4 minutes until it stands firm when lifted. Remove the flatbread from the oven and spread a tablespoon of taco sauce across the surface of each flatbread, leaving a bit of space around the edge for the crust. Top the sauce with the taco meat mixture from step one, dividing it evenly between the two flatbreads. Add about half the chopped tomatoes. Sprinkle the cheddar cheese over the top.

Return the flatbread to the middle rack of the oven and bake for another 5 minutes until the cheese is melted and the edges are lightly browned. Remove from the oven and top with the desired amount of shredded lettuce. Sprinkle the remaining chopped tomatoes over the top. Slice and serve immediately.