Preheat oven to 400F; line a muffin tray with 12 paper liners.
Pour the milk into a small bowl and sprinkle the lemon juice on top; let it sit for 3 minutes without stirring.
Whisk together the flour, sugar, baking powder, salt, and baking soda in a large bowl.
Whisk together the milk, eggs, oil, and vanilla in a medium bowl.
Add the wet ingredients to the dry all at once and stir just until combined, being careful not to overmix. Gently fold in the candied orange peel and dark chocolate.
Pour the batter into the prepared muffin wells, and bake until a toothpick inserted inside comes out with just a couple crumbs, about 15 to 20 minutes, being careful not to overbake.
Cool completely, and then melt the white chocolate and drizzle it on top. Let the chocolate set before serving.
Notes
When baking, butter adds flavor but oil results in a tender, moist crumb.
Instead of using milk + fresh lemon juice, you can use ¾ cup buttermilk.