Prepare Classic Waffle Batter: In a mixing bowl, combine all-purpose flour, sugar, baking powder, baking soda, and salt. In a separate bowl, whisk together buttermilk, eggs, melted butter, and vanilla extract. Gently fold the wet ingredients into the dry until just combined.

Prepare Red Velvet Batter: In another bowl, whisk together flour, cocoa powder, sugar, baking powder, baking soda, and salt. In a separate bowl, mix buttermilk, egg, melted butter, vanilla, and red food coloring. Combine wet and dry ingredients, mixing until just combined.

Preheat Waffle Iron: Preheat to manufacturer’s recommended temperature, typically around 350°F.

Create Marbled Effect: Lightly grease the waffle iron and pour alternate spoonfuls of the classic and red velvet batters into the center. Use a toothpick to gently swirl the batters together.

Cook the Waffles: Close the waffle iron and cook until golden brown, usually around 4-6 minutes.

Serve: Remove the waffles and enjoy warm, topped with whipped cream, fresh berries, or maple syrup.