Preheat your oven to 350°F (175°C) and prepare a 9-inch round cake pan by greasing and flouring it.

In a large mixing bowl, whisk together the flour, sugar, baking powder, salt, and ground cinnamon.

In a separate bowl, beat the eggs until frothy, then add the vegetable oil and vanilla, mixing until smooth.

Gently fold the chopped apples into the wet mixture.

Pour the wet mixture into the dry ingredients and stir until just blended.

Transfer the batter into the prepared cake pan, smoothing the top.

Bake in the preheated oven for 30 to 35 minutes or until golden brown.

Allow the cake to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.