Ina Garten's Blueberry Crumb Cake

There are no words for how yummy this cake is. 

For the streusel:

1/4 c. granulated sugar
1/3 c. light brown sugar, lightly packed
1 tsp. ground cinnamon
1/8 tsp. ground nutmeg
1/4 lb. (1 stick) unsalted butter, melted (I use salted butter)
1 1/3 cups all-purpose flour (I decreased this to 1 1/4 c.)

For the cake:

6 Tbl. unsalted butter, at room temperature (3/4 stick)
3/4 c. granulated sugar
2 eggs, at room temperature
1 tsp. vanilla extract
1/2 tsp. grated lemon zest (I substitute a splash of lemon juice)
2/3 c. sour cream
1 1/4 c. all-purpose flour
1 tsp. baking powder
1/4 tsp. baking soda
1/2 tsp. kosher salt
1 c. fresh blueberries (I use almost 2 cups)
Confectioners' sugar for sprinkling (I don't bother with this)

Preheat the oven to 350 degrees F. Butter and flour a 9-inch round baking pan.

For the streusel:
Combine the granulated sugar, brown sugar, cinnamon, and nutmeg in a bowl. Stir in the melted butter and then the flour. It will look strange at first, and you will wonder if I've led you astray with this recipe, but I promise it will all come together.  Mix well and set aside.

For the cake:
Cream the butter and sugar in the bowl of an electric mixer fitted with the paddle attachment on high speed for 4 to 5 minutes, until light. Reduce the speed to low and add the eggs 1 at a time, then add the vanilla, lemon zest, and sour cream. In a separate bowl, sift together the flour, baking powder, baking soda, and salt. With the mixer on low speed, add the flour mixture to the batter until just combined. Fold in the blueberries (I toss my blueberries with about a tablespoon of flour before adding -- it prevents them from sinking to the bottom of the cake) and stir with a spatula to be sure the batter is completely mixed.

Spoon the batter into the prepared pan and spread it out with a knife. With your fingers, crumble the topping evenly over the batter. Bake for 40 to 50 minutes, until a cake tester comes out clean. Cool completely and serve sprinkled with confectioners' sugar.

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