Prepare the Basil-Garlic Mayo: Stir together mayonnaise, basil, and garlic in a small bowl. Season with salt and pepper to taste. Set aside until ready to serve.

Prepare the Bacon: Heat oil in a large skillet over high heat until shimmering but not smoking. Add bacon. Cook until crisp, about five minutes per side. Transfer to a paper-towel lined plate.

Prepare the Waffles: In medium mixing bowl, whisk together white rice flour, cornstarch, sweet rice flour, baking powder, granulated sugar, rosemary, salt, xanthan gum, and black pepper. In small bowl, whisk together milk, eggs, and oil until smooth.

Pour wet ingredients over dry ingredients. Using balloon whisk or handheld mixer, blend until batter is smooth. No lumps should remain.

Heat waffle iron according to manufacturer's directions. Spray iron generously with non-stick cooking spray. Spoon batter onto hot iron (amount of batter will vary depending on your iron) and bake until golden brown and crisp.

Assemble: Remove waffles from iron. Break apart. Spread basil-garlic mayonnaise evenly over waffles. Top with lettuce, tomato and bacon slices. (You might need to break the bacon slices in half so they fit on the waffle.)