Position a rack in the lower third of the oven. Preheat the oven to 350°F. Grease a 9-inch springform pan and line the bottom with a round of parchment paper.
Prepare and set aside:
Spread evenly in the pan:
Whisk together in a medium bowl:
Beat in a large bowl, or in a stand mixer with the paddle attachment, until fluffy:
Beat in one at a time just until blended:
Stir in the flour mixture just until incorporated. Scrape the batter into the pan and spread evenly. Scatter the streusel on top. Bake until the topping is golden brown and a toothpick inserted in the center of the cake comes out clean, 40 to 45 minutes.
Let cool in the pan on a rack for 15 minutes, then remove the pan ring and let cool completely.