Prepare the Cookie Dough:
Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
Add the egg and vanilla extract, and beat until well combined.
In a separate bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon.
Gradually add the dry ingredients to the wet ingredients, mixing just until combined.
Stir in the milk until the dough becomes smooth and slightly sticky.
Gently fold in the blueberries, being careful not to overmix.
Shape and Bake the Cookies:
Scoop out 1 1/2-inch balls of dough and place them onto the prepared baking sheet.
Sprinkle the streusel topping generously over each cookie.
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