Ingredients
For the Crumb Topping and Filling:
1 + 3/4 cups all-purpose flour
1 cup packed light-brown sugar, divided
1 + 1/4 teaspoons ground cinnamon, divided
coarse salt
1 + 1/2 sticks (12 tablespoons) cold unsalted butter, cut into small pieces
1 + 1/2 cups coarsely chopped walnuts or pecans, divided
For the Cake:
1 stick (8 tablespoons) unsalted butter, at room temperature, plus more for pan
2 cups all-purpose flour
1 + 1/4 teaspoons baking powder
1/2 teaspoon baking soda
coarse salt
1 cup granulated sugar
2 large eggs
1 + 1/2 teaspoons pure vanilla extract
1 cup sour cream
For the Glaze:
1 cup confectioners’ sugar
2 tablespoons whole milk
Preparation
