1. In a medium bowl, add the flour, baking powder, butter, egg, sugar, salt, and milk. Mix well.2. Once combined, gently fold in the blueberries.3. Grease in baking pan.4. Pour blueberry batter into pan and spread evenly.
5. In a small bowl, combine the sugar, flour, cinnamon, and butter using a fork until crumbly.6. Sprinkle mixture on top of batter evenly.7. Place pan in preheated oven.8. Remove from oven once baked through and allow to cool before slicing!