12 tablespoons (1 1/2 sticks) unsalted butter at room temperature
1 1/2 cups granulated sugar
3 large eggs at room temperature
2 teaspoons pure vanilla extract
1 1/4 cups vanilla yogurt
2 1/2 cups unbleached a.p. flour
2 teaspoons baking powder
1/2 teaspoon baking soda
1/2 teaspoon kosher salt
1/2 teaspoon ground cinnamon
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
For the glaze:
1/2 cup confectioners' sugar
2 tablespoons real maple syrup
splash of milk
Preheat the oven to 350 degrees F. Grease and flour a 10-inch tube pan.
1. 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 yogurt. In a separate bowl, sift together the flour, baking powder, baking soda, salt, and cinnamon. 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.
2. 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.
3. Spoon half the batter into the pan and spread it out with a knife. Sprinkle with half the streusel. Spoon the rest of the batter in the pan, spread it out, and scatter the remaining streusel on top. Bake for 45 minutes, until a cake tester comes out clean.
4. 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 milk if necessary, to make the glaze runny. Drizzle as desired on the cake.
Go ahead, have 2 slices!