Pre-heat waffle maker to medium-high heat.
In a large bowl, whisk together both flours, sugar baking powder, and salt.
In a separate medium bowl, whisk together buttermilk, melted butter, and vanilla.
Pour wet ingredients into bowl with dry ingredients and whisk until just combined, taking care not to over-mix.
Spray waffle iron with baking spray. Cook according to your waffle maker's instructions (I pour about ⅓ cup of batter into each well of waffle maker cook with the lid closed for about 5-6 minutes, until waffles are golden brown and crispy). Let waffles cool before making sandwiches.
Spread ½ Tbsp mayonnaise onto each waffles (you can use more or less depending on your mayo preferences).
Break bacon strips in half and divide them between two waffles. Top with deli turkey, tomatoes, lettuce and sandwich together with remaining waffles. Slice and serve!