In another bowl, mix the melted butter with the granulated sugar and brown sugar, and beat. Add the eggs and yogurt, and beat again. Add the mandarin orange zest, milk, and vanilla, and mix.

Add the egg mixture to the flour mixture and mix well. Gently fold in the blueberries and mix until just combined.

Divide the batter evenly among the muffin cups. Bake the muffins for about 27 minutes, until golden brown and a toothpick inserted in the center comes out clean.

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