1 1/2 teaspoons baking powder
1/4 teaspoon baking soda
1/4 teaspoon salt
1 cup butter or 1 cup margarine
1 3/4 cups sugar
2 tablespoons lemon juice
1 tablespoon lemon zest
1 teaspoon vanilla extract
1 cup buttermilk
1 1/4 cups fresh blueberries, tossed with
1 tablespoon flour
2. In a large bowl, whisk together flour, baking powder, baking soda and salt. Set aside.
3. In another large bowl, beat butter (or margarine) until smooth. Add sugar and beat for 2 to 3 minutes until fluffy. Beat in eggs, one at a time, beating well after each addition. Add lemon juice, lemon zest and vanilla and beat until combined. Beat in flour in three additions, alternating with buttermilk. Beat for 2 minutes. Fold in blueberries. Spoon into prepared pan.
4. Bake at 350F for 50 minutes or until a toothpick inserted in center of cake comes out clean. Cool on a wire rack for 20 minutes. Run a sharp knife around edges of the pan. Turn out and cool completely.