To Die For Blueberry Muffins

INGREDIENTS

• 1 1/2 cups all-purpose flour
• 3/4 cup white sugar
• 1/2 teaspoon salt
• 2 teaspoons baking powder
• 1/3 cup vegetable oil
• 1 egg
• 1/3 cup milk
• 1 cup fresh blueberries
• 1/2 cup white sugar
• 1/3 cup all-purpose flour
• 1/4 cup butter, cubed
• 1 1/2 teaspoons ground cinnamon