Follow these simple steps to create your Salted Caramel Apple Sheet Cake:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour a 9×13-inch baking pan.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, sugar, baking soda, baking powder, salt, cinnamon, and nutmeg.
3. Combine Wet Ingredients: In another bowl, mix the melted butter, buttermilk, eggs, and vanilla extract until smooth.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, stirring until just combined. Be careful not to overmix.
5. Fold in Apples: Gently fold in the diced apples until evenly distributed throughout the batter.
6. Pour Batter: Pour the batter into the prepared baking pan, smoothing the top with a spatula.
7. Bake: Place in the preheated oven and bake for 30-40 minutes or until a toothpick inserted in the center comes out clean.
8. Cool: Once baked, remove from the oven and allow the cake to cool in the pan for about 20 minutes before transferring it to a wire rack to cool completely.
9. Add Caramel: Drizzle the caramel sauce over the cooled cake and sprinkle with sea salt for added flavor.
10. Slice: Cut the cake into squares or rectangles and serve as desired.

These straightforward steps will guide you in crafting this amazing Salted Caramel Apple Sheet Cake effortlessly.