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Square slice of coffee cake with thick cinnamon streusel topping on a speckled ceramic plate with a fork, showing moist yellow cake interior with cinnamon swirl layer. Additional cake slices visible on baking sheet in background on rustic wood surface.

Cinnamon Streusel Coffee Cake


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  • Author: Christina
  • Total Time: 1 hr 10 mins
  • Yield: 9 servings 1x

Description

This sour cream coffee cake has a thick cinnamon streusel topping and a cinnamon sugar swirl baked right through the middle. Tender, moist, and even better the next day. Perfect for brunch or weekend baking.


Ingredients

Units Scale

Cinnamon Middle

  • 1/4 cup (50 grams) white sugar
  • 2 teaspoons cinnamon

Cake

  • 1/2 cup (113 grams) unsalted butter, room temperature
  • 1/3 cup (67 grams) white sugar
  • 2 eggs, room temperature
  • 3/4 cup (180 grams) sour cream
  • 2 cups (240 grams) all-purpose flour
  • 1 teaspoon baking powder
  • 1/4 teaspoon baking soda
  • A pinch of salt

Streusel

  • 1 cup (120 grams) all-purpose flour
  • 1/2 teaspoon cornstarch
  • 1/3 cup (75 grams) unsalted butter, cold and cut into 1-inch pieces
  • 2 teaspoons cinnamon
  • 1/4 cup (50 grams) white sugar

Instructions

Cinnamon Middle

  1. Mix the sugar and cinnamon together in a small bowl. Set aside.

Cake

  1. Preheat your oven to 355°F (180°C). Line a 9-inch square pan with parchment paper.
  2. Beat the butter and sugar together in a medium bowl until light and fluffy, about 3 minutes.
  3. Add the eggs and sour cream, then beat until everything’s combined and smooth.
  4. Sift the flour, baking powder, baking soda, and salt into the bowl. Mix just until you don’t see any dry streaks.

Streusel 

  1. Whisk together the flour, cornstarch, cinnamon, and sugar in a small bowl.
  2. Add the cold butter pieces to the dry ingredients. Use your fingers to squeeze and rub the butter into pea-sized crumbs, making sure each piece gets coated in flour.

Assembly 

  1. Spread half the cake batter into your prepared pan, smoothing it into an even layer.
  2. Sprinkle the cinnamon sugar mixture evenly over the batter.
  3. Dollop the remaining batter on top and gently spread it to cover the cinnamon layer.
  4. Scatter the streusel evenly over the top.
  5. Bake for 50 to 60 minutes, until a toothpick inserted in the centre comes out clean or with just a few moist crumbs.
  6. Let the cake cool in the pan for 10 minutes, then transfer to a cooling rack. Slice and serve warm or at room temperature.

Notes

If your streusel feels too soft to crumble, pop it in the fridge for 5 minutes before sprinkling. And yes, this is even better the next day when the flavours have had time to meld. :)

  • Prep Time: 20 mins
  • Cook Time: 50 mins
  • Category: Cake
  • Method: Baking