Preheat oven to 350. Have a ungreased 9 by 13 inch baking pan ready.
In a large bowl combine flour and sugar, cut in cold butter and mix to have a fine crumb mixture. This can be done with a few quick pulses in the food processor or with finger tips
Remove 3/4 cup crumb mixture and pat in bottom of baking pan, it will be thin and dry, which is how it should be.
Add sour cream, egg, baking soda, salt, cinnamon, pumpkin pie spice, cinnamon and vanilla to remaining crumb mix in bowl, mix in with a spoon until combined, fold in apples
Drop mixture on top of crust in pan in even clumps, using an offset spatula or back of a spoon spread carefully over crust in even layer
Sprinkle toffee pieces evenly over batter in pan.
Bake for 35 to 40 minutes until golden brown.
Cool completely on wire rack. Cut into bars.
