Blackberry Coffee Cake

For the Streusel Topping:

• 1/2 cup flour (60g)
• 1/4 cup brown sugar, packed (53g)
• 2 tablespoons granulated sugar (25g)
• 1/2 teaspoon cinnamon
• Pinch of salt
• 4 tablespoons butter, melted (56g)

For the Cake:

• 1 1/2 cup all purpose flour (180g)
• 1 1/2 teaspoons baking powder
• 1/4 teaspoon baking soda
• 1/4 teaspoon salt
• 1/2 cup unsalted butter, room temperature (113g)
• 2/3 cup granulated sugar (133g)
• 2 large eggs, room temperature
• 1 teaspoon vanilla extract
• 1/2 cup sour cream (120g)
• 2 tablespoons milk (30g)
• 1 1/2 cups fresh blackberries (6 ounces, 170g)

1. Preheat and prepare the pan: Preheat oven to 350°F. Grease an 8x8-inch pan or line with parchment paper for easy removal.
2. Make the streusel topping: In a small bowl, stir together flour, brown sugar, granulated sugar, cinnamon, and salt. Add the melted butter and mix with a fork. The mixture will be thick. Set aside.
3. Mix the dry ingredients: In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
4. Cream the butter and sugar: Use a stand mixer fitted with a paddle attachment (or a large bowl and a hand mixer) to cream the butter and sugar until light and fluffy, about 2–3 minutes.
5. Add eggs and vanilla: Add the eggs one at a time, mixing well after each addition. Mix in the vanilla extract.
6. Mix in sour cream and milk: Add sour cream and milk to the wet mixture and mix until combined.
7. Combine wet and dry ingredients: Add the dry ingredients to the wet ingredients and mix until just combined. Do not overmix at this step.
8. Fold in blackberries: Gently fold in the blackberries, trying not to break them up too much. Some batter may turn purple, but that’s okay.
9. Transfer batter and add streusel: Spoon cake batter into the baking dish and spread evenly with a butter knife or spatula. Break up the streusel topping with your fingers or a fork if needed, then sprinkle it evenly over the top.
10. Bake: Bake for 45–50 minutes, or until a toothpick inserted into the center comes out clean. Let cool to room temperature before serving.

Makes 9 servings