Lemon Blueberry Loaf

For Loaf

For loaf, preheat oven to 350°F (180°C) and grease and sugar a 9 x 5-inch (2-L) loaf pan. In a large bowl, cream butter and sugar until smooth. Stir in lemon zest and vanilla. Beat in egg and egg yolks, until fully incorporated. In separate bowl, sift 1 cup (250 mL) all-purpose flour,