Spinach And Potato Gratin
["1 tsp. butter or margarine", "3 large shallots, thinly sliced", "2 - 10 oz. pkg. frozen chopped spinach, thawed and squeezed dry", "1/8 tsp. ground nutmeg", "1 tsp. salt", "1/2 tsp. coarsely ground black pepper", "3 lbs. all purpose potatoes (9 medium), peeled and cut into 1/4 in. thick slices", "4 oz. Gruyere cheese, shredded (1 cup)", "1 1/2 c. milk", "1 c. heavy or whipping cream", "1 Tbsp. cornstarch"]
["Preheat oven to 350\u00b0.", "Grease shallow 3 quart casserole.", "In 10 inch skillet, melt margarine or butter over medium heat - add shallots and cook 5 minutes or until tender, stirring occasionally.", "Remove skillet from heat and stir in spinach, nutmeg, 1/4 tsp. salt and 1/4 tsp. pepper."]
["butter", "shallots", "spinach", "ground nutmeg", "salt", "ground black pepper", "potatoes", "Gruyere cheese", "milk", "heavy", "cornstarch"]