Sour Cream Coffee Cake
- 12 tablespoons (1 1/2 sticks) unsalted butter at room temperature
- 1 1/2 cups granulated sugar
- 3 extra-large eggs at room temperature
- 1 1/2 teaspoons pure vanilla extract
- 1 1/4 cups sour cream
- 2 1/2 cups cake flour (not self-rising)
- 2 teaspoons baking powder
- 1/2 teaspoon baking soda
- 1/2 teaspoon kosher salt
- For the streusel:
- 1/4 cup light brown sugar, packed
- 1/2 cup all-purpose flour
- 1 1/2 teaspoons ground cinnamon
- 1/4 teaspoon kosher salt
- 3 tablespoons cold unsalted butter, cut into pieces
- 3/4 cup chopped walnuts, optional
- For the glaze:
- 1/2 cup confectioners' sugar
- 2 tablespoons real maple syrup
Preheat the oven to 350 degrees F. Grease and flour a 10-inch tube pan.
Cream the butter and sugar in the bowl of an electric mixer fitted with the paddle attachment for 4 to 5 minutes, until light. Add the eggs 1 at a time, then add the vanilla and sour cream. In a separate bowl, sift together the flour, baking powder, baking soda, and salt. With the mixer on low, add the flour mixture to the batter until just combined. Finish stirring with a spatula to be sure the batter is completely mixed.
Spoon half the batter into the pan and spread it out with a knife. Sprinkle with 3/4 cup streusel. Spoon the rest of the batter in the pan, spread it out, and scatter the remaining streusel on top. Bake for 50 to 60 minutes, until a cake tester comes out clean.
Let cool on a wire rack for at least 30 minutes. Carefully transfer the cake, streusel side up, onto a serving plate. Whisk the confectioners' sugar and maple syrup together, adding a few drops of water if necessary, to make the glaze runny. Drizzle as much as you like over the cake with a fork or spoon.
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