Blueberry Zucchini Squares Recipe

Preheat oven to 350 °. Grease a 15x10x1-in. baking pan. In a small bowl, combine zucchini, buttermilk, lemon peel and lemon juice; toss to combine. In a large bowl, cream butter and sugar until light and fluffy. Beat in eggs, one at a time. In another bowl, whisk 3-1/4 cups flour, baking soda and salt; gradually add to creamed mixture alternately with zucchini mixture, mixing well after each addition. Toss blueberries with remaining flour; fold into batter. Transfer batter to prepared pan, spreading evenly (pan will be full). Bake 30-35 minutes or until light golden brown and a toothpick inserted in center comes out clean. Cool completely in pan on a wire rack. In a small bowl, mix glaze ingredients until smooth; spread over top. Let stand until set.