Cherry 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, 2 cups cherries, pitted

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 pieces3/4 cup chopped walnuts, optional

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. Carefully add cherries to a batter.

For the streusel, place the brown sugar, flour, cinnamon, salt, and butter in a bowl and pinch together with your fingers until it forms a crumble. Mix in the walnuts, if desired.

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.