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You’ll need 2 ½ cups of fresh blueberries for this recipe. If using frozen blueberries, do so unthawed, but be aware that this may affect the overall color of your buckle. Reserve ½ cup of blueberries to sprinkle on top later. Gently fold the remaining blueberries into the batter, taking care not to crush them.
Assembling the Buckle
Prepare your baking dish by lining an 8 x 8-inch pan with parchment paper, greasing it lightly with butter or baking spray. Pour the batter into the prepared pan, smoothing it out with an offset spatula.
Take your streusel topping from earlier, clumping it together before breaking it into smaller pieces, and sprinkle it evenly over the batter. Move on to add the reserved blueberries on top for an attractive finish.