Preheat your oven to 350°F. Grease a muffin tin or line it with paper liners for easy cleanup. In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt. Add the milk, melted butter, eggs, lemon zest, lemon juice, and vanilla extract. Whisk until smooth and well combined.

Divide the batter evenly among the prepared muffin cups, filling each about 2/3 full. Bake in the preheated oven for 20-25 minutes , or until the pies are golden brown around the edges and set in the center.

Remove from the oven and let the pies cool in the pan for 5 minutes before transferring them to a wire rack to cool completely. Dust the cooled pies with powdered sugar for a touch of elegance. Serve plain or top with whipped cream and fresh berries for an extra indulgent treat.