Cinnamon Streusel Coffee Cake with a Soft Sour-Cream Crumb

This sour-cream coffee cake has a soft, close crumb, a narrow cinnamon-sugar ribbon, and a buttery streusel that stays crisp at the edges. It is baked in an 8-inch square pan and cut into nine generous squares—easy to portion for a brunch table or an afternoon coffee break. The batter is thicker than a pourable cake batter. That is intentional: a thick layer supports the cinnamon filling and keeps it from sinking to the bottom. Use softened butter and room-temperature sour cream so the batter combines smoothly without needing extra mixing. Build a tender crumb without overmixing Start with butter that yields when pressed but still feels cool, not shiny or melted. Cream it with the sugar for two to three minutes until lighter and fluffy; this step helps make the cake tender. Add the eggs one at a time so the mixture stays emulsified. If it looks slightly curdled after an egg, add a spoonful of the measured flour and continue mixing. Alternate the flour mixture with sour cream on low…

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