In a large mixing bowl combine: the flour, sugar, baking powder, baking soda, and salt. Mix well to combine.
Now melt the butter in the microwave or a pot and allow a few minutes to cool.
Measure out 1 cup of milk into a measuring cup with space so you can add 1 cracked egg along with the lemon zest. Stir well to combine. Once the butter has cooled a bit, add it as well.
Make a well in the center of the dried ingredients and pour in the wet ingredients.
Mix it all together until it is just combined and there is no dry flour. You don't need to work out any lumps. It's important not to overmix the batter.
Gently fold the fresh blueberries into the waffle batter.
The batter can sit out while the waffle maker heats up. The batter will thicken some as the flour hydrates.
Once the waffle maker is hot. Brush butter on both top and bottom of the waffle maker then add your batter.
Cook the waffle until they are golden brown and are easy to remove with a spatula that won't scratch the waffle maker.
You can keep waffles warm in an oven set to the lowest temperature. Don't stack the waffles. they will get soggy.
Serve with powdered sugar, butter, and/or real maple syrup.