Preheat your waffle iron to medium.
In a bowl, mix together flour, baking powder, sugar and salt.
Whisk 2 eggs, milk and melted butter together and pour into the dry ingredients; whisk until the batter is combined. Fold in the shredded cheddar and herbs of your choice.
Pour a heaping cup of the batter onto your waffle iron and cook until the waffles are cooked through and have a golden-brown hue.
Repeat until all of the batter is used, and assemble your breakfast sandwiches using the warm waffles, additional melted cheddar, cooked bacon and eggs, and any desired toppings.