• Preheat oven to 350℉/180℃. Grease the pan. For easy removal of the cake, place parchment paper on the bottom and 2 sides of the pan. Grease again and then set aside. Slice the cherry plums into quarters.

For the streusel

• In a medium-sized bowl, add cold butter, sugar, and flour. Mix until a crumb forms. This will be your streusel. Set aside in the fridge to chill as you make the cake batter.
  3/4 cups all-purpose flour, 1/3 cup white sugar, 6 tbsp butter

For the cake

• In a medium-sized bowl, add in the flour, white sugar, baking powder, and salt. Mix together.
  3/4 cups white sugar, 1 1/2 cups all purpose flour, 1 1/2 tsp baking powder, 1/4 tsp salt
• In a large bowl, add the dry ingredients and about 1/3 of the butter. Mix on low, and keep adding in the butter until a crumbly texture forms. The key to a tender cake is mixing as little as possible, so only mix until just combined!
  3/4 cup unsalted butter
• Add the eggs and egg yolk in one at a time, mixing in between each addition. Then, add in the vanilla. On low speed, continue mixing until just combined.
  1 tbsp vanilla extract, 1 egg yolk, 2 eggs
• Mix in the milk, making sure it's well incorporated. The batter will be smooth. If it is clumpy, this means your wet ingredients weren't at room temperature before beginning.
  1/3 cup milk
• Add the batter into the prepared pan and spread evenly. Then take the cherry plums and place them on top of the batter. I cut mine in quarters, but you can dice them up however you'd like.
  6 cherry plums
• Sprinkle the streusel on top and bake for 25-30 minutes. The cake will be ready when a toothpick inserted comes out clean.
• Allow to cool, slice, and enjoy! This cake is SO delicious and perfect for the summer time!