1-First Step: Prepare Your Equipment Preheat your oven to 350°F (175°C). This temperature allows the cake to bake evenly without drying out the edges. While the oven heats, spray a 9×13-inch metal pan with nonstick cooking spray. A metal pan conducts heat efficiently and promotes even baking throughout. If you only have glass or ceramic bakeware, don’t worry the cake will still turn out delicious, though you’ll need to add 5-10 extra minutes to the baking time.

2-Second Step: Make the Streusel In a medium bowl, combine the streusel ingredients: ½ cup packed light brown sugar, ½ cup all-purpose flour, ½ cup finely chopped pecans, 1 teaspoon ground cinnamon, and 6 tablespoons melted unsalted butter. Stir everything together until the mixture becomes crumbly and resembles coarse sand. The pecans should be finely chopped so they distribute evenly throughout the streusel layers. Set this aside while you prepare the cake batter those buttery, cinnamon-spiced crumbs will become the star of your finished cake.

3-Third Step: Mix the Dry Ingredients In a large mixing bowl, whisk together all your dry ingredients: 2 cups all-purpose flour, 1 teaspoon baking powder, ½ teaspoon baking soda, ½ teaspoon fine sea salt, 2 teaspoons ground cinnamon, 1 teaspoon ground ginger, and ½ teaspoon ground nutmeg. Then add both sugars 1 cup packed light brown sugar and ½ cup granulated sugar to the bowl. Whisking everything together ensures even distribution of the leavening agents and spices, which prevents spotty flavor or uneven rising in your finished cake.

4-Fourth Step: Combine the Wet Ingredients In a separate bowl, blend together your wet ingredients: 1 cup pumpkin puree, ½ cup vegetable oil, ½ cup room temperature sour cream, and 2 beaten eggs. Make sure your sour cream is at room temperature before mixing cold sour cream can cause the batter to seize or become lumpy. Whisk these ingredients until they’re completely smooth and fully incorporated. The mixture should look uniform with no visible streaks of egg or sour cream.

5-Fifth Step: Create the Batter Now comes the important part. Create a well in the center of your dry ingredients by pushing them toward the edges of the bowl. Pour the wet ingredient mixture into this well. Using a spatula or wooden spoon, stir gently from the center outward, incorporating the dry ingredients into the wet ones. Stop stirring as soon as no dry flour remains visible overmixing develops gluten and creates a tough, dense cake. The batter should be thick and slightly sticky, which is exactly what you want for a moist pumpkin sour cream coffee cake.

6-Sixth Step: Layer the Batter and Streusel Spread half of your batter evenly into the prepared 9×13-inch pan. This takes a bit of patience since the batter is thick. Use an offset spatula or the back of a spoon to spread it into an even layer. Sprinkle half of your streusel mixture over this first batter layer, making sure to distribute the pecans evenly. Add the remaining batter on top it helps to dollop small amounts across the surface, then gently spread them together. Finally, top everything with the remaining streusel, pressing it lightly into the batter so it adheres during baking.

7-Seventh Step: Bake to Perfection Place your pan on the center rack of the preheated oven and bake for 35 minutes. The cake is done when a toothpick inserted into the center comes out clean or with just a few moist crumbs attached. If you’re using a glass or ceramic pan, add 5-10 extra minutes to account for the slower heat conduction. Avoid opening the oven door during the first 20 minutes of baking this can cause the cake to sink. Once baked, remove the pan from the oven and let it cool in the pan for exactly 15 minutes. This resting period allows the structure to set properly.

8-Final Step: Add the Maple Glaze and Serve While the cake cools, prepare the glaze. In a small bowl, whisk together 1 cup sifted powdered sugar and 2 tablespoons maple syrup until smooth and thick. The consistency should be pourable but not runny if it’s too thick, add maple syrup by the teaspoon; if too thin, add more powdered sugar. Drizzle this glaze over the warm cake in a back-and-forth motion. The warmth helps the glaze set into a beautiful, glossy finish. Cut the cake into squares and serve immediately, or let it cool completely before storing.