Copycat Panera Blueberry Muffins

Preheat oven to 400 degrees. Grease a 12-cup muffin pan with nonstick cooking spray. In a large mixing bowl, whisk together 3 cups of flour, 1 1/2 cups of sugar, baking powder, and salt. In a medium mixing bowl, whisk together the canola oil, eggs, buttermilk, and vanilla extract until well-combined. Pour the wet mixture into the dry mixture and gently stir until well-incorporated. Fold in the blueberries. Divide batter evenly between the prepared muffin cups. In a small bowl, combine the remaining flour and sugar with the cinnamon. Cut in the butter until coarse crumbs form. Sprinkle even amounts of the streusel topping over each muffin. Bake muffins for about 30 minutes, or until a toothpick inserted in center of a muffin comes out clean.