Grease and flour your 9 or 10-inch Bundt pan. This is an essential step to ensure your cake doesn't stick to the pan. Set the pan aside.
Preheat your oven to 350°F (175°C) to ensure it's hot when you’re ready to bake the cake.
In a medium-sized bowl, whisk together the all-purpose flour, baking soda, ground cinnamon, ground nutmeg, and salt. Set this dry ingredient mixture aside.
Dice your apples and toss them with the lemon juice to prevent browning. Set aside.
In a large mixing bowl, blend together the oil, granulated sugar, and light brown sugar until well combined. Then, stir in the applesauce and vanilla extract. Beat in the egg until the mixture is smooth and fully incorporated.
Gradually add the dry ingredients to the wet mixture, stirring gently until the batter is just combined. The batter will be thick.
Gently fold the diced apples into the batter. Be careful not to overmix as this can make the cake dense.