ASHKENAZIC SOUR CREAM COFFEE CAKE (SMETENEH KUCHEN)

Steps:

• Preheat the oven to 350°F (325°F if using a glass pan).
• Grease one 9-inch square pan,9-inch Bundt or tube pan, or 9-inch springform pan.
• Line with parchment or waxed paper, grease again, and dust with flour.
• To make the streusel: Combine the sugar, flour, cinnamon, salt, and nutmeg if using.
• Cut in the butter to resemble coarse crumbs.
• If desired, stir in the nuts.
• To make the batter: Sift together the flour, baking powder, baking soda, and salt.
• In a large bowl, beat the butter until smooth, about 1 minute.
• Gradually add the sugar and beat until light and fluffy, about 4 minutes.
• Beat in the egg yolks, one at a time.
• Blend in the sour cream, vanilla, and zest if using.
• Stir in the flour mixture.
• Spread half of the batter in the prepared pan.
• Sprinkle with half of the streusel.
• Carefully cover with the remaining batter and sprinkle with the remaining streusel.
• Bake until the cake is golden and pulls away from the sides of the pan, about 50 minutes.
• Set on a rack and let cool in the pan for at least 15 minutes.
• Serve warm or at room temperature.
• Wrap the kuchen in plastic and store at room temperature for up to 2 days or in the freezer for up to 3 months.
• To make the glaze if using: Combine all the glaze ingredients, stirring until smooth and of pouring consistency.
• Drizzle over the cake and let stand until set.