Position a rack in the lower third of the oven and heat the oven to 350°F. Grease and flour a 9-inch springform or round cake pan; set a round of waxed paper or parchment in the bottom of the pan.
Set the cake in its pan on a rack to cool for 10 min. Gently tap the pan on the counter to see if the cake is releasing from the sides. Set another rack on top of the cake, invert it, and carefully remove the pan (if using a springform pan, unclasp it and remove the bottom). Lay the other rack on the cake again and invert it so the streusel side is up. Let cool completely. Just before serving, put the confectioners’ sugar in a fine sieve and lightly dust the cake, if you like.
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