Prepare using BREAKSTONE'S Reduced Fat or KNUDSEN Light Sour Cream.
Potatoes can be cooked and mashed up to 1 hour before assembling recipe. Spoon hot mashed potatoes into heatproof bowl; cover with plastic wrap. Place bowl over a pot of simmering water. Let stand until ready to assemble recipe just before baking.
Purchasing and Storing Mushrooms
Look for fresh mushrooms that are blemish-free, without slimy spots or signs of decay. When sealed in plastic, mushrooms quickly become slimy and moldy. Remove from carton and refrigerate, unwashed, in a paper bag. The paper absorbs excess moisture and allows the mushrooms to breathe. Or, remove plastic wrap from carton and wrap carton in paper towels.