Preheat oven to 375°F Coat cookie sheets with nonstick cooking spray. In a medium bowl, cream together the butter and sugar until light and fluffy. Beat in the egg, lemon juice, and lemon peel. Stir in the flour, baking powder, and salt just until the dry ingredients are mixed. Stir in the zucchini and nuts. Drop by rounded teaspoonfuls 2 inches apart onto the cookie sheets. Bake for 15 to 20 minutes, until cookies are golden around the edges. Remove to a wire rack to cool completely.
*Note: Mr. Food topped these with a homemade glaze made of 1/2 cup confectioners sugar and 2 teaspoons of fresh lemon juice combined together and drizzled over the cooled cookies.