For the Muffins:
- 1 ¾ cups all-purpose flour
- ¾ cup granulated sugar
- 2 teaspoons baking powder
- ½ teaspoon baking soda
- ½ teaspoon salt
- Zest of 2 oranges
- ¾ cup fresh orange juice (about 2 oranges)
- ½ cup unsalted butter, melted (or vegetable oil for a lighter version)
- 2 large eggs
- 1 teaspoon vanilla extract
- ½ cup plain Greek yogurt or sour cream
- ½ cup mini chocolate chips or chopped nuts (optional)
For the Glaze (Optional):
- 1 cup powdered sugar
- 2–3 tablespoons fresh orange juice