Preheat oven to 375℉.
Line a muffin pan with paper liners or grease the pan.
Add lemon juice to the milk and let sit 1-2 minutes to thicken.
In a large bowl, whisk together milk, eggs, melted butter, and vanilla.
Stir in sugar.
Add 2 cups of flour and baking soda and stir until just combined.
Toss raspberries in remaining ¼ cup of the flour.
Fold in raspberries and white chocolate.
Fill prepared muffin pan with the batter. (About ¼ cup of batter per muffin cup.)
Sprinkle coarse sugar over tops of muffins, optional.
Bake in preheated oven for 22-25 minutes or until muffins are baked through.
Cool in pan for 2-3 minutes before transferring to a cooling rack to finish cooling.