Preheat oven to 350ºF.
Using a hand mixer on medium, mix the oil and sugar until incorporated.
Add eggs and mix agin until smooth.
Add baking soda, salt, vanilla, and cinnamon. Mix again until incorporated.
Turn off the mixer and mix in the white flour and spelt flour by hand. Do not overmix.
In a separate bowl, toss the apples in lemon juice making sure that they are all coated.
Pour in the cake batter and mix until combined.
Bake for 1 hour if you are using the bundt pan or 30-45 minutes if you are using the 9x13 pan.