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1
Preheat to 375u00b0F Line fourteen muffin cups with paper or foil cupcake liners (you can make 12 muffins).
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2
Fit a food processor with the steel blade. With the machine on, drop the orange pieces through the feeder tube. Process until finely chopped, then measure 1/4 cup pulp and return it to the processor bowl. (Discard any remaining orange.) Add the cream cheese and process in three 10-second intervals, scraping down the side of the bowl after each process. The mixture should retain some orange texture.
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3
In a large bowl, thoroughly whisk together the flour, baking powder, salt and baking soda. Set aside.
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4
Cut the butter into 1-inch pieces and place in the bowl of an electric mixer fitted with the paddle attachment. Mix on medium speed until smooth and lightened in color, about1 minute. Stop the machine, add the cream cheese/orange mixture, then mix on medium speed for 1 minute. Add the sugar in a steady stream, then blend in the eggs, the yolk, and the vanilla.
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5
Reduce the mixer speed to low and add the flour mixture in three additions, mixing just until blended after each addition.
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6
Spoon about 1/4 cup of the batter into each muffin cup. Bake for 22 to 25 minutes, or until the muffins are golden brown and the tops are springy to the touch. (To ensure even baking, toward the end of baking time, rotate the pans top to bottom and front to back.) Remove from the oven and place on a rack to cool.
