Creating Maple Walnut Coffee Cake is straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Prepare a 9-inch round cake pan by greasing it with butter or lining it with parchment paper.
2. Mix Dry Ingredients: In a bowl, whisk together the flour, baking powder, baking soda, salt, and ground cinnamon (if using).
3. Beat Butter and Sugars: In a separate large bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
4. Add Eggs and Flavorings: Beat in the eggs one at a time, followed by the maple syrup, sour cream, and vanilla extract until well combined.
5. Combine Mixtures: Gradually add the dry ingredient mixture to the wet ingredients, stirring just until blended. Do not overmix.
6. Fold in Walnuts: Gently fold in the chopped walnuts until they are distributed evenly throughout the batter.
7. Bake: Pour the batter into the prepared cake pan and bake for 40-45 minutes. Check for doneness by inserting a toothpick into the center; it should come out clean.
8. Cool: Once baked, remove the cake from the oven and let it cool in the pan for about 15 minutes. Then, transfer the cake to a wire rack to cool completely.

This simple method will guide you in creating a delightful Maple Walnut Coffee Cake that everyone will love!