Preheat your oven to 350°F (175°C). Grease and flour a bundt pan.
In a large mixing bowl, whisk together the gluten-free flour, sugar, baking powder, baking soda, cinnamon, and salt.
Add the applesauce, vegetable oil, eggs, and vanilla extract. Mix until well combined.
Fold in the diced apples.
Pour the batter into the prepared bundt pan and spread it out evenly.
Bake for 50 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes, then turn it out onto a wire rack to cool completely.