01 - Preheat heart-shaped waffle iron according to manufacturer instructions. Lightly grease with melted butter or nonstick spray.
02 - In a large bowl, whisk together flour, sugar, baking powder, and salt until well blended.
03 - In a separate bowl, beat eggs thoroughly. Add milk, melted butter, and vanilla extract, mixing until uniform.
04 - Pour wet ingredients into dry ingredients. Stir gently until just combined; do not overmix. Small lumps are acceptable and ensure tender waffles.
05 - Pour approximately 1/2 cup batter onto preheated waffle iron. Close lid and cook until golden and crisp, approximately 3 to 5 minutes per batch.
06 - Remove cooked waffles and place on a wire rack or warm oven to maintain crispness. Repeat with remaining batter.
07 - Arrange waffles on serving plates. Top with mixed berries, dust generously with powdered sugar, and drizzle with maple syrup or honey if desired. Garnish with fresh mint leaves.