Preheat oven to 350°F (175°C). Lightly grease or spray your muffin tin.
Mix wet ingredients: In a bowl, whisk together eggs, sugar, melted butter, milk, lemon juice, zest, and vanilla extract.
Add flour and salt: Slowly add in flour and pinch of salt. Whisk until smooth and combined. (Or use a blender for an ultra-smooth batter.)
Pour & bake: Divide batter evenly among muffin cups (fill each about ¾ full).
Bake for 25–28 minutes or until centers are set and tops are golden.
Cool in the pan for 10 minutes, then transfer to a wire rack.
Serve with a dusting of powdered sugar or a dollop of whipped cream.