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Export 9 ingredients for grocery delivery
Step 1
Heat oven to 350 degrees and butter a 9-by-9-inch metal pan.
Step 2
In a large bowl, whisk together the sour cream, butter, eggs, vanilla and salt until everything is well combined. Whisk in sugar. Add the dry ingredients in this order: baking powder, baking soda and cinnamon, whisking well in between additions. Then, whisk in the flour until just combined. Fold in blueberries.
Step 3
Using a spatula, scrape the batter into the pan, smoothing the top. Sprinkle with the nuts and Demerara sugar. Bake until the top is golden and puffed, and a toothpick inserted into the center of the cake comes out clean, about 50 to 60 minutes. Transfer the cake to a rack, and let it cool in the pan.