Making Pecan Apple Crisp Coffee Cake is straightforward. Follow these steps for a delicious result:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking pan.
2. Mix Dry Ingredients: In a large mixing bowl, combine the 2 cups of flour, 1 cup of granulated sugar, baking powder, baking soda, salt, and 1 teaspoon of cinnamon.
3. Cream Butter and Sugar: In another bowl, cream together the softened butter and remaining sugar until light and fluffy.
4. Add Eggs and Vanilla: Beat in the eggs one at a time, then stir in the vanilla extract.
5. Incorporate Sour Cream: Mix in the sour cream until well blended.
6. Combine Mixtures: Gradually add the dry mixture to the wet ingredients, stirring until just combined.
7. Fold in Apples and Pecans: Gently fold in the diced apples and chopped pecans, ensuring they are evenly distributed throughout the batter.
8. Prepare the Topping: In a separate bowl, mix together the brown sugar, flour, cinnamon, melted butter, and chopped pecans until crumbly.
9. Spread Batter: Pour the batter into the prepared baking pan, spreading it evenly.
10. Add Topping: Sprinkle the topping mixture over the batter evenly.
11. Bake: Place the pan in the preheated oven and bake for 40-45 minutes, or until a toothpick inserted into the center comes out clean.
12. Cool: Once baked, remove the cake from the oven and allow it to cool in the pan for about 15-20 minutes before serving.

By following these steps, you’ll create a delightful Pecan Apple Crisp Coffee Cake that will impress everyone at your gathering!