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Preheat oven to 350°F (175°C) and grease a 9x9-inch baking pan.
Prepare the cake: In a bowl, mix the flour, sugar, baking powder, and salt.
In a separate bowl, beat butter, eggs, milk, lemon zest, and lemon juice until smooth.
Gradually add the dry ingredients to the wet ingredients and mix until combined.
Fold in the blackberries gently, then pour the batter into the prepared pan.
Make the crumble topping: In a small bowl, mix the flour, sugar, butter, and cinnamon until it forms crumbs.
Sprinkle the crumble topping evenly over the cake batter.
Bake for 40-45 minutes or until a toothpick comes out clean.
Let cool before slicing and serving.
Serving and Storage Tips:
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