Heat the oven to 400 degrees.
Butter a small 8 x 8 pan or 4 8 oz ovenproof ramekins.
In a bowl, combine milk and egg. Add the melted butter.
In a separate bowl, add the flour, sugar, salt, and baking powder and combine.
Stir the dry mixture gently into the wet mixture.
Fill the prepared pan with batter or divide equally amongst the ramekins.
Bake for 15-20 minutes or until just done.
Serve with lemon sauce.