In a large bowl, cream the butter and sugar until light and fluffy; add the egg. Combine flour, baking soda, and cinnamon in a separate bowl. Gradually beat flour mixture into the butter-sugar mixture. Fold in apples and pecans.
Pour into a greased, 9-inch square pan and bake at 350 degrees for 32–38 minutes or until a toothpick inserted comes out clean.
Cool on a wire rack and serve with a dollop of whipped cream.
Recipe Notes
Note: This cake can be warmed up later and served with whipped cream.