Strawberry Coffee Cake

Strawberry Coffee Cake For the strawberry filling 8 oz fresh strawberries diced (about 1 1/3 cups) 1/4 cup granulated sugar 2 tablespoon cornstarch 1 tablespoon cold water 1 teaspoon lemon juice For the Crumb Topping 1/3 cup all-purpose flour 1 1/2 tablespoon granulated sugar 2 1/2 tablespoon butter chilled and diced into cubes 1 1/2 tablespoon Brown Sugar For the Cake 1 3/4 cup all-purpose flour 1 teaspoon baking powder 1/2 teaspoon baking soda 1/2 teaspoon salt 7 tablespoon butter , softened 1 cup granulated sugar 1 large egg 1 teaspoon vanilla extract 1/3 cup sour cream 1/3 cup buttermilk Preheat oven to 350 degrees. Prepare strawberry filling In a small saucepan whisk together 1/4 cup sugar and cornstarch. Stir in cold water and lemon juice. Add diced strawberries. Stir mixture over medium heat, just until it reaches a light boil. Reduce heat to low and cook 1 minute more, stirring constantly. Remove from heat and set aside to cool. Prepare crumb topping In a medium size mixing bowl add 1/3 cup flour, 1 1/2 Tbsp sugar and 2 1/2 Tbsp butter. Cut ingredients together with a pastry blender until fluffy and well combined. Add brown sugar and stir with a fork. Set aside. Prepare the cake In a small bowl stir together 1 3/4 cup flour, baking powder, baking soda and salt. In another mixing bowl add 7 Tbsp softened butter and 1 cup sugar. Beat with electric mixer for several minutes, until mixture is pale and fluffy. Mix in egg and vanilla. Stir in the sour cream. Add the dry ingredients alternating with buttermilk in two separate batches and mix just until combine. (Don't overmix!) Assemble the cake Evenly spread 1/2 of the cake batter into a greased 8x8 baking dish. Spoon strawberry mixture over batter layer and gently spread evenly. Dollop remaining cake batter by the spoonfuls over strawberry mixture and gently spread batter into an even layer. Sprinkle the crumb topping evenly over the top of the cake. Bake at 350 degrees F for 50-55 minutes, or until toothpick inserted into center comes out clean. Allow to cool slightly before serving.