Step 1

Preheat the oven to 425 degrees Fahrenheit and grease a muffin tin with cooking spray.

Step 2

In a large mixing bowl, stir together flour, sugar, baking powder, and salt.

Step 3

In a medium bowl or liquid measuring cup, whisk together yogurt, oil, orange juice, vanilla, and eggs. Stir in orange zest.

Step 4

Pour the wet ingredients into the dry ingredients, stirring with a wooden spoon just until combined. Lumps are ok!

Step 5

Spoon batter evenly into 10 muffin cups. Sprinkle each muffin with 1/4 tsp sugar for a crunchy exterior. Bake for 8 minutes at 425°F and then reduce the heat to 350°F (keeping muffins in oven) and bake for another 10 minutes, or until a fork comes out clean. Cool muffins in tin for 10 minutes before transferring to a wire rack to cool. You may need to run a knife along the edge of the muffin tin to help loosen them out.