Sweetheart Fudge Pie

1/2 cup butter or margarine, softened
3 eggs
3/4 cup firmly packed brown sugar
1 (12 ounce) package semisweet chocolate morsels, melted
2 teaspoons instant coffee powder
1 teaspoon rum extract
1/2 cup all-purpose flour
1 cup walnuts, coarsely chopped
1 unbaked 9-inch pie shell
1/2 cup whipping cream or Cool Whip
Maraschino cherries

Cream butter; gradually add brown sugar, beating at medium speed until light and fluffy. Add eggs, one at a time, beating well after each addition. Add melted chocolate, coffee powder and rum extract, mixing well. Stir in flour and walnuts. Pour mixture into prepared shell. Bake at 375 degrees F for 25 minutes; cool completely on wire rack. Chill.