Big Apple Pancake

Source: Gourmet
http://www.alexandracooks.com/2012/10/21/big-apple-pancake/
1/2 stick (1/4 cup) unsalted butter
1 large sweet apple such as Gala or Golden Delicious, peeled, cored, and cut into 1/4-inch-wide wedges
1/2 cup whole milk
1/2 cup all-purpose flour
4 large eggs
3 tablespoons granulated sugar
1/2 teaspoon vanilla
1/4 teaspoon salt
Confectioners sugar for dusting
1. Put oven rack in middle position and preheat oven to 450°F.
2. Melt butter in skillet over moderate heat, then transfer 2 tablespoons to a blender or food processor. Add apple wedges to skillet and cook, turning over once, until beginning to soften, 3 to 5 minutes. (They don’t need to caramelize, just soften.)
3. While apple is cooking, add milk, flour, eggs, granulated sugar, vanilla, and salt to butter in blender and blend until smooth. (Do do this step — I didn’t the first time around and the batter was really lumpy.)
4. Pour batter over apple and transfer skillet to oven. Bake until pancake is puffed and golden, about 15 minutes. Dust with confectioners sugar and serve immediately.