Pre-heat oven to 350° (180° celsius). Grease and flour a 9" (24 centimeter) spring-form cake pan.
In a medium bowl toss together sliced apples and lemon juice, set aside.
In a small bowl mix together cinnamon and sugar, set aside.
In a medium bowl cream butter and sugar, then add eggs one at a time, mix well, then add oil, vanilla and milk and beat till smooth.
In a small bowl whisk together flour, baking powder and 1 teaspoon cinnamon, add to batter and beat on medium until smooth.
Spoon batter into the prepared cake pan, top with sliced apples (do not press down), sprinkle with cinnamon sugar mix. Bake for approximately 50-60 minutes or until toothpick comes out clean. Let cool or serve warm. Enjoy!