Ingredients

• 1 1/2 cups white sugar
• 1/2 cup butter, softened
• 2 eggs
• 4 cups all-purpose flour
• 4 teaspoons baking powder
• 1/2 teaspoon salt
• 1 cup milk
• 4 cups fresh blueberries
• Topping:
• 1 1/3 cups white sugar
• 1 cup all-purpose flour
• 1 teaspoon ground cinnamon
• 2/3 cup cold butter

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Instructions

1. Preheat oven to 375 degrees F (190 degrees C). Grease a 9x13-inch baking pan.
2. Beat 1 1/2 cups sugar and 1/2 cup butter in a bowl using an electric mixer until creamy and smooth; beat in eggs. Whisk 4 cups flour, baking powder, and salt together in a separate bowl. Stir flour mixture into creamed butter mixture, alternating with milk, until batter is just combined; fold in blueberries. Pour batter into the prepared pan.
3. Combine 1 1/3 cups sugar, 1 cup flour, and cinnamon together in a bowl; cut in 2/3 cup cold butter using a pastry blender or 2 knives until topping is crumbly. Sprinkle topping over batter.
4. Bake in the preheated oven until a toothpick inserted into the center comes out clean, 40 to 45 minutes. Cool buckle on a wire rack.