Preheat Oven
Set oven to 350°F (175°C) and grease a 10-inch bundt or tube pan.
Prepare Apples
In a large bowl, toss apple slices with lemon juice, cinnamon, and sugar. Set aside.
Make the Batter
In another large bowl, whisk together flour, sugar, baking powder, and salt.
Add oil, eggs, orange juice, and vanilla. Beat until smooth and well combined.
Layer the Cake
Pour 1/3 of the batter into the prepared pan.
Spread half of the apple mixture evenly over the batter.
Add another 1/3 of the batter, followed by the remaining apples.
Top with the last 1/3 of the batter.
Bake
Bake for 1 hour 15 minutes to 1 hour 30 minutes, or until a toothpick inserted in the center comes out clean.
Cool & Serve
Allow to cool in the pan for at least 20 minutes before inverting onto a wire rack to cool completely.
Slice and serve plain or with a dusting of powdered sugar.