Preheat oven to 350°F (180°C) and line a muffin tin with paper liners.
In a large bowl, whisk together the flour, baking powder, and a pinch of salt.
In another bowl, cream together the softened butter and sugar until light and fluffy. Add the eggs one at a time, then stir in the vanilla extract.
Zest the oranges and squeeze the juice. Add both to the butter mixture.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk, and mix until just combined.
Fill the muffin liners about three-quarters full with batter.
Bake in the preheated oven for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Let the muffins cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.
Before serving, dust the tops with powdered sugar.
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