Step 1

Preheat oven to 300 degrees F. Grease and flour a 9- x 5-inch loaf pan.

Step 2

In a large bowl, cream butter with an electric mixer on medium speed; gradually add granulated sugar, beating until light and fluffy.

Step 3

Add eggs, one at a time, beating after each addition. Gradually add 2 cups flour alternately with milk, beginning and ending with flour and mixing well after each addition. Stir in vanilla and blueberries that have been tossed in the remaining 1 tablespoon flour (see Note).

Step 4

Pour batter into prepared pan and bake 1 hour and 25 minutes, or until a toothpick inserted in center comes out clean. Cool in pan 15 to 20 minutes then remove to a wire rack. Let cool completely then sprinkle with confectioners' sugar.