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A freshly baked rhubarb coffee cake, sliced and ready to serve.

Moist Rhubarb Coffee Cake with Cinnamon Streusel

This delightful coffee cake features a moist crumb, tart rhubarb, and a sweet, crunchy cinnamon streusel topping. Perfect for breakfast, brunch, or an afternoon treat, it's sure to become a family favorite.
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Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Servings: 8 slices
Calories: 350
Ingredients Equipment Method Notes

Ingredients
  

Streusel Topping
  • 1/2 cup all-purpose flour
  • 1/2 cup granulated sugar
  • 1/4 cup packed light brown sugar
  • 1 teaspoon ground cinnamon
  • 1/2 cup unsalted butter, melted
Coffee Cake
  • 2 cups all-purpose flour
  • 1 cup granulated sugar
  • 2 teaspoons baking powder
  • 1/2 teaspoon baking soda
  • 1/4 teaspoon salt
  • 1 large egg, room temperature
  • 1 cup sour cream, room temperature
  • 1/2 cup unsalted butter, melted
  • 1 teaspoon vanilla extract
  • 1 1/2 cups rhubarb stalks, finely diced

Equipment

  • Medium bowl
  • Whisk
  • 9x13 inch baking pan
  • Large bowl
  • Toothpick

Method
 

Streusel Topping
  1. Whisk together flour, granulated sugar, brown sugar, and cinnamon in a medium bowl.
  2. Pour in the melted butter and mix until crumbs form; set aside.
Coffee Cake
  1. Preheat oven to 350°F (175°C) and grease a 9x13 inch baking pan.
  2. In a large bowl, whisk together flour, granulated sugar, baking powder, baking soda, and salt.
  3. In a separate bowl, whisk the egg, then add sour cream, melted butter, and vanilla extract, mixing until combined.
  4. Pour the wet ingredients into the dry ingredients and mix until just combined, being careful not to overmix.
  5. Gently fold in the diced rhubarb.
  6. Pour the batter into the prepared baking pan and spread evenly, then sprinkle the streusel topping over the batter.
  7. Bake for 45-55 minutes, or until a toothpick inserted into the center comes out clean.

Notes

Ensure all cold ingredients like egg and sour cream are at room temperature for a smoother batter and a moister cake. Do not overmix the batter, as this can lead to a tough cake. The baking time may vary depending on your oven, so keep an eye on it. This cake is delicious served warm or at room temperature. Store leftovers in an airtight container at room temperature for up to 3 days or in the refrigerator for up to 5 days.