Place broken bread pieces in bottom of 10x15 greased baking dish. Spread flaked salmon over bread, then add 1 1/2 cups of cheese. Mix together all the other ingredients and pour over salmon/cheese layer; cover with remaining 1 1/2 cups of cheese. Bake in a 350 degree oven for 45 minutes to an hour, or until an insterted knife comes out clean.
TIP: Better if made ahead several hours or even the night before. Just refrigerate and allow a few extra minutes of baking time.
TIP: Instead of bread, try cooking 14 ounces of shell macaroni for the bottom layer. Top the casserole with crushed potato chips during the last 15 minutes of baking.