Pre-heat oven to 425 F with the 13 x 9 inch baking dish inside.
Saute Apples: In an extra-large skillet over medium, heat the butter and saute the apples, stirring until tender, about 10 minutes. Add the pecans, lightly toasting. When the apples begin to caramelise, stir in the maple syrup and a pinch of salt and and turn off the heat. Make the batter by placing everything in a blender (eggs, milk, flour, vanilla, maple syrup, salt, cardamom, nutmeg, cinnamon) and blend or whisk until smooth.
When the oven is fully preheated remove the heated baking dish, and add 2 tablespoons butter, brushing the sides and bottom. Add the caramelised apples and spread out evenly on the bottom. Pour the batter over top. Grate with extra nutmeg if you like.
Lower heat to 400F. Place on the middle rack with ample room on top and bake 30 minutes or until beautifully puffed and deeply golden.
Serve immediately with maple syrup. Feel free to sprinkle with powdered sugar.