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Make the streusel first by combining the flour, brown sugar, cold cubed butter, cinnamon and salt in a bowl. Use a fork or pastry cutter to cut the butter into the dry ingredients until pea-sized crumbs form. Refrigerate while making the cookie dough.
Whisk together the flour, baking powder and salt in a separate bowl. Gradually mix the dry ingredients into the wet ingredients until just combined, being careful not to overmix.
Very gently fold in the fresh blueberries, trying not to break them up too much.
Remove the streusel from the fridge and generously top each dough round with streusel crumbs, gently pressing them in.
Bake at 375°F for 12-15 minutes, until lightly golden but still quite soft in the middles.
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