01 - Preheat heart-shaped waffle iron according to manufacturer instructions. Lightly grease with melted butter or nonstick spray.
02 - Whisk together flour, sugar, baking powder, and salt in a large bowl until evenly distributed.
03 - Beat eggs in a separate bowl, then add milk, melted butter, and vanilla extract. Whisk until smooth.
04 - Pour wet ingredients into dry ingredients. Stir gently until just combined, leaving some small lumps. Avoid overmixing for optimal texture.
05 - Pour approximately 1/2 cup batter onto preheated waffle iron. Close lid and cook until golden brown and crisp, about 3 to 5 minutes per batch.
06 - Remove cooked waffles and keep warm. Repeat with remaining batter. Arrange waffles on plates, top with mixed berries, dust with powdered sugar, and drizzle with maple syrup or honey. Garnish with fresh mint if desired.