Core and peel the apples then cut into ¼ inch slices (about 12 slices per apple).
Cream the sugar and butter in a large bowl, then add eggs and vanilla.
Combine dry ingredients, then add to wet stirring just enough to combine. Fold in the walnuts.
Grease springform pan and spread batter into pan.
Top with concentric rings of apple slices and sprinkle with cinnamon sugar if desired.
Bake for about an hour until a toothpick comes out clean.
Serve with whipped cream or ice cream if desired.
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Notes
For an easier, more casual, method, chop the apples (you can even leave unpeeled and chop in a food processor) then mix into the batter with the walnuts Spread into a 9 x 13″ cake pan and bake at 350 degrees for about 35 minutes or until a toothpick comes out clean .
I am not a health professional and nutrition data is calculated programatically. Accuracy may vary with product selection, calculator accuracy, etc. Consult a professional for the best information.