01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or grease lightly.
02 - Whisk together flour, sugar, poppyseeds, baking powder, baking soda, and salt in a large bowl.
03 - Whisk ricotta, eggs, melted butter, milk, lemon juice, lemon zest, and vanilla in a separate bowl until smooth and thoroughly blended.
04 - Fold wet mixture into dry ingredients with a spatula until just combined. Avoid overmixing to preserve tenderness.
05 - Divide batter evenly among prepared muffin cups, filling each approximately three-quarters full.
06 - Bake for 18 to 22 minutes until a toothpick inserted into the center emerges clean and tops are lightly golden.
07 - Let muffins rest in the tin for 5 minutes. Transfer to a wire rack to cool completely.