Preheat the oven to 350°F and lightly grease a 9x13-inch baking pan.

In a large mixing bowl, combine the all-purpose flour, baking powder, baking soda, salt, sugar, and cinnamon. Whisk to blend thoroughly.

Stir in the melted butter, sour cream, eggs, and vanilla extract until the batter is smooth. Pour the batter into the prepared baking pan and spread evenly.

Scatter the diced apples evenly across the top of the batter.

For the topping, mix the flour, brown sugar, pecans, cinnamon, salt, and melted butter in a medium bowl until well combined. Sprinkle this mixture evenly over the apples.

Bake for 40 to 45 minutes, or until a toothpick inserted in the center comes out clean.

While the cake bakes, prepare the glaze by combining the brown sugar, apple cider, and butter in a small saucepan over medium heat. Stir until the sugar dissolves and the butter melts.

Drizzle the warm glaze over the cake once baked. Serve warm or at room temperature.