Bursting Blueberry Cardamom Buckle

Bahan-bahan (8 porsi)

• 1 1/2 cups all-purpose flour
• 2 teaspoons baking powder
• 1/2 teaspoon ground cardamom
• 3/4 cup light brown sugar
• 1 stick (1/2 cup) salted butter, melted
• 2/3 cup whole milk
• 2 large eggs
• 2 teaspoons vanilla extract
• 2 teaspoons lemon zest
• 2 cups fresh blueberries
• 1/2 cup all-purpose flour
• 1/4 cup light brown sugar
• 1/2 teaspoon ground cinnamon
• 4 tablespoons salted butter, at room temperature