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a single square of the best easy plum crumb cake drizzled with glaze

The Best Easy Plum Streusel Coffee Cake

  • Author: Heidi Clark~Yums & Kisses
  • Prep Time: 20 minutes
  • Cook Time: 50 minutes
  • Total Time: 1 hour 10 minutes + cooling time
  • Yield: 9 1x
  • Diet: Vegetarian


The Best Easy Plum Streusel Coffee Cake!  Moist vanilla cake filled with pieces of juicy summer plums is topped with a sweet and buttery oat crumble topping and finished with a generous drizzle of lemon glaze!  Perfect for breakfast, snacking, or paired with a scoop of vanilla ice cream for dessert!



For the Streusel Topping:

5 Tablespoons butter, melted

1/2 cup all-purpose flour

1/4 cup rolled oats

1 teaspoon cinnamon

1/4 teaspoon sea salt

1/4 cup granulated sugar

1/4 cup packed light brown sugar

For the Cake:

8 Tablespoons butter, softened

3/4 cup granulated sugar

Zest of 1 large lemon

1 large egg, at room temperature

3/4 cup buttermilk

1 Tablespoon vanilla extract

2 cups all-purpose flour

1/2 teaspoon sea salt

1 teaspoon baking soda

1 teaspoon baking powder

1 1/4 cups diced plums, about 2 plums

For the Glaze:

1 cup powdered sugar, sifted

1 Tablespoon butter, melted

12 Tablespoons lemon juice

pinch of salt

1/4 teaspoon vanilla extract


  • Preheat the oven to 350°
  • Lightly spritz a 9 x 9 metal baking pan with cooking spray
  • Prepare the streusel topping by combining all of the ingredients. The mixture will be quite moist. Refrigerate while assembling the cake.
  • Place the diced plums on paper towels to drain excess moisture while preparing the cake batter.
  • In a stand mixer, using the paddle attachment, mix the sugar and zest on medium speed for 1-2 minutes. Add the butter and continue mixing on medium speed until the butter is light, fluffy, and pale yellow. {About 4 minutes}
  • Add the buttermilk, egg, and vanilla. Continue mixing on medium speed to incorporate the addition. The mixture will look very curdled!  No worries! You’re doing great! Keep going!
  • Whisk together the flour, salt, baking soda, and baking powder. Add to the butter/egg mixture and mix on low speed until the flour is fully incorporated and the batter is mostly smooth.
  • Gently stir in the drained diced plums.
  • Pour the batter into the prepared pan
  • Remove the streusel topping from the fridge.
  • Using the tines of a fork break the topping into tiny pieces. I use my fingertips to finish breaking the topping into fine moist crumbs.
  • Sprinkle the streusel topping evenly over the cake.
  • Bake for 45-50 minutes. The cake is done when a toothpick inserted into the center comes out with a few moist crumbs clinging to it.
  • Cool the cake for at least one hour.
  • Combine the glaze ingredients and drizzle over the cake.
  • Serve and enjoy!
  • Cover any leftover coffee cake and store at room temperature for up to 3 days. 


  • Try your favorite summer fruit in this recipe! Blueberries, blackberries, and diced peaches will all be lovely!
  • Be sure to sift the powdered sugar before making the glaze, or it will not have a smooth appearance.
  • Category: Coffee Cake
  • Method: Bake
  • Cuisine: American

Keywords: plum coffee cake, plum streusel cake, summer fruit cake, plums, coffee cake, easy baking recipe , breakfast coffee cake