High Altitude (3500 to 6500 feet): Make cake mix following high-altitude directions on package for 13 x 9 x 2-inch rectangle. Bake at 350 degrees F for 1 hour 5 minutes to 1 hour 20 minutes.
* 18.25 ounce boxes of cake mix have been replaced by 16.5 ounce and 15.25 ounce boxes. To compensate for the volume loss in a 16 ounce box, whisk 6 tablespoons all-purpose flour into the dry cake mix before proceeding with the recipe. To compensate for the volume loss in a 15.25 ounce box, add 1/2 cup + 3 tablespoons all-purpose flour and 1/4 teaspoon baking powder.
** If using thawed frozen rhubarb, drain it on paper towels and pat dry with more paper towels, so the custard layer doesn't get too runny.
*** For best results, use our Pan Release!
Per serving: Calories 345 (Calories from Fat 160); Fat 18 g (Saturated 8 g); Cholesterol 75mg; Sodium 240 mg; Carbohydrate 44g (Dietary Fiber 1 g); Protein 3 g
% Daily Value: Vitamin A 8%; Vitamin C 10%; Calcium 12%; Iron 14%