Blueberry Swirl Streusel Muffins Ingredients 2 cups (10 ounces) fresh blueberries 1 1/8 cups (7 3/4 ounces) plus 1 teaspoon sugar divided 2 1/2 cups (12½ ounces) all-purpose flour 2 1/2 teaspoons baking powder 1 teaspoon salt 2 large eggs 4 tablespoons unsalted butter, melted and cooled ¼ cup vegetable oil I used canola