Zucchini Olive Oil Cake with Mandarin Orange Glaze and Walnut Olive Brittle

Name: Zucchini Olive Oil Cake with Mandarin Orange Glaze and Walnut Olive Brittle
Ingredients: Nonstick cooking spray; 2 cups all-purpose flour, plus more for pan; 1 teaspoon baking powder; 1 teaspoon kosher salt; 1/2 teaspoon baking soda; 2 teaspoons ground cinnamon; 1 teaspoon ground ginger; 1/2 teaspoon ground nutmeg; 3 large eggs; 1 3/4 cup sugar; 1 cup extra-virgin olive oil; 2 teaspoons pure vanilla extract; 2 1/2 cups grated zucchini; 1 cup walnut pieces, chopped; Mandarin Orange Glaze, recipe follows; Walnut Olive Brittle, recipe follows; 1/2 cup sugar; 6 mandarin oranges, segmented, juices reserved; 2 tablespoons unsalted butter; 1 tablespoon heavy cream; 1 cup sugar; 1/2 cup walnuts, finely chopped; 2 tablespoons pitted and finely chopped black olives