Preheat oven to 380 degrees F. Line a muffin tin with cupcake liners or spar with cooking spay. Set aside.
Coat the blueberries in the reserved dry mixture and add to the batterl.
Mix the granulated sugar, all-purpose flour, cubed butter, and brown sugar together with a fork
With an ice-cream scoop, fill the muffin tin with the batter, add the crumb topping, and press down so that the crumbs are stuck to the batter.