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Preheat the oven to 375 degrees F (190 degrees C). Grease a 9x13-inch baking dish.
Prepare buckle: Beat together sugar and butter in a large bowl using an electric mixer until creamy and smooth. Add eggs one at a time, mixing well after each addition. Whisk together flour, baking powder, and salt in a separate bowl; stir into creamed butter mixture, alternating with milk, until just combined. Fold in blueberries. Pour batter into the prepared dish.
Prepare topping: Combine sugar, flour, and cinnamon in a medium bowl. Cut in cold butter using a pastry blender or 2 knives until crumbly. Sprinkle topping over batter.
Bake in the preheated oven until a toothpick inserted into the center comes out clean, 40 to 45 minutes. Cool on a wire rack.