Naked Carrot Cake

Name: Naked Carrot Cake
Ingredients: Nonstick cooking spray; 3 cups all-purpose flour; 1 tablespoon baking powder; 2 teaspoons baking soda; 2 teaspoons ground cinnamon; 1 teaspoon ground ginger; 2 1/2 cups light brown sugar; 1 1/2 cups vegetable oil; 6 large eggs; 2 teaspoons vanilla; 4 cups grated carrot (about 1 1/2 pounds); One 20-ounce can crushed pineapple, drained and juice squeezed out (about 1 1/2 cups); 1 cup chopped pecans; 1 pound cream cheese, at room temperature; 8 ounces (2 sticks) unsalted butter; 2 cups powdered sugar; 3 teaspoons orange extract; Zest from 1 orange, plus more for garnish