I made this last week, and it was easy and well received. It was from Midwest Living October 2008.
4 pounds cooking apples, peeled, cored, and slices (about 12 cups)
2 cups sugar
1/3 cup water
2 tablespoons cider vinegar
2 teaspoons ground cinnamon
1/4 teaspoon ground cloves
1/8 teaspoon ground allspice
1/8 teaspoon ground nutmeg
Place apple slices in a 4 quart slow cooker. Stir in sugar, water. vinegar, cinnamon, cloves, allspice and nutmeg.
Cover, cook on high heat setting 5-6 hours. Stir. Cool at least an hour . or cover and chill overnight. Ladle apple butter into half-pint storage or freezer containers, leaving a 1/2 inch headspace. Seal and label. Store 3 weeks in refrigerator or for 1 year in freezer.