Sour Cream Coffee Cake

Instructions

1. Position your oven rack to the center and heat to 350°F. Butter your 9x13-inch pan generously — every corner and edge. This prevents sticking and helps create golden edges.
2. Combine the flour, brown sugar, and cinnamon in a small bowl. These dry ingredients need to be evenly distributed before you add the butter — lumpy cinnamon spots aren't appealing.
3. Work the cold butter cubes into the flour mixture using your fingertips or a pastry cutter. You want rough, uneven crumbs ranging from pea-sized to breadcrumb-fine. Set this aside while you make the cake.
4. Whisk the flour, sugar, baking powder, and salt together in your largest bowl. Make sure there are no lumps — the baking powder especially likes to clump.
5. In another bowl, whisk together the melted butter, sour cream, eggs, and vanilla until completely smooth. The mixture should be pale yellow and unified — no streaks of egg white visible.
6. Pour the wet mixture over the dry ingredients and fold together using a rubber spatula. Stop as soon as you don't see dry flour — overmixing creates tough, dense cake.
7. Scrape the batter into your prepared pan and spread it evenly to the corners. The batter is thick, so use your spatula to coax it into an even layer.
8. Distribute the streusel evenly over the surface, letting it fall naturally into peaks and valleys. Don't press it down — you want those crispy bits to stay light.
9. Bake until the top is golden brown and a toothpick inserted in the center comes out with just a few moist crumbs clinging to it. The streusel should look set and lightly caramelized.

   ⏱ 45 min
10. Let the cake rest in the pan — this cooling time helps it set up so it won't crumble when you cut it. Serve warm or at room temperature.

    ⏱ 10 min