Preheat your oven to 350 degrees
Prepare a 2-quart baking dish by greasing it with non-stick cooking spray. Separate your eggs into egg whites and egg yolks, set aside
In a large bowl, mix together flour, melted butter, and 1 ½ cups of the granulated sugar
Mix in the egg yolks, milk, lemon zest, and lemon juice until fully combined
In a separate bowl, beat egg whites until medium stiffness (5 minutes)
Slowly add in the remaining ½ cup of sugar and beat until stiff
Gently fold the egg whites into the batter using a spatula until just combined
Pour batter into prepared baking dish. Fill a larger baking dish with 1 inch of hot water, and carefully place the prepared dish inside
Bake in preheated oven for 55-60 minutes until browned
Carefully remove from oven and sprinkle generously with the confectioners’ sugar. Serve warm or chilled