Cinnamon Coffee Cake
"The bakery classic with the streusel topping that falls off in your lap. Worth every crumb."
Costco Copycat — This is a homemade version of the Costco Bakery item. See it in store →
The Game Plan
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Preheat oven to 350°F (175°C). Grease a 9x13 baking pan.
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Make the streusel first — you'll thank yourself later. Mix brown sugar, flour, and cinnamon in a bowl. Cut in cold butter with a fork or your fingers until it looks like coarse, sandy crumbles. Set aside.
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Cream softened butter and sugar until light and fluffy, about 3 minutes.
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Beat in eggs one at a time, then add vanilla and sour cream. Mix until smooth.
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In a separate bowl, whisk flour, baking powder, baking soda, and salt. Fold the dry ingredients into the wet just until combined. The batter will be thick — that's correct.
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Spread half the batter into the prepared pan. Sprinkle half the streusel over it in an even layer.
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Carefully spread the remaining batter on top (an offset spatula helps here). Top with the rest of the streusel.
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Bake 40-45 minutes until a toothpick comes out clean and the streusel is golden.
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While still warm, whisk together powdered sugar and milk. Drizzle the glaze over the top in lazy lines.
