01 - Preheat oven to 350°F. Line a 12-cup muffin tin with paper liners or lightly grease with butter or oil.
02 - In a large bowl, whisk together ricotta, milk, oil, eggs, vanilla, lemon zest, and lemon juice until smooth.
03 - In a separate medium bowl, combine flour, sugar, baking powder, baking soda, and salt.
04 - Add the dry mixture to the wet mixture. Stir gently with a spatula until just combined—do not overmix.
05 - Gently fold in the raspberries, being careful not to break them apart too much.
06 - Divide the batter evenly among the 12 muffin cups. If desired, sprinkle tops with coarse sugar for a crunchy finish.
07 - Bake for 20–24 minutes, or until a toothpick inserted in the center comes out clean.
08 - Cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.