Heat oven to 350°F. Grease bottoms and sides of 3 (5x3-inch) loaf pans with shortening; lightly flour. In medium bowl, mix flour, baking powder and salt. In another medium bowl, mix sugar, oil and 2 tablespoons orange peel with wire whisk until blended. Stir in sour cream and eggs until well mixed. Add sugar mixture to flour mixture, gently stirring just until blended. Gently stir in 1/2 cup of the frozen cranberries.