01 - Set oven to 350°F and arrange paper liners in a 12-cup muffin tin or lightly grease the pan.
02 - Combine the flour, granulated sugar, baking powder, baking soda, and salt in a large mixing bowl using a whisk.
03 - In a separate bowl, whisk together ricotta cheese, eggs, whole milk, cooled melted butter, orange zest, orange juice, and vanilla extract until smooth.
04 - Add the wet mixture to the dry ingredients and stir gently until just combined. Do not overmix; slight lumps are acceptable.
05 - Spoon the batter into the muffin tin, filling each cup about three-quarters full.
06 - Sprinkle each muffin with coarse sugar and a touch of additional orange zest if preferred.
07 - Place the tin in the oven and bake for 18 to 22 minutes, until a toothpick inserted into the center comes out clean.
08 - Let muffins cool in the tin for five minutes before transferring to a wire rack to cool completely.