Marbled Orange Fudge

1 1/2 teaspoons plus 3/4 cup butter (no substitutes),divided
3 cups sugar
3/4 cup whipping cream
1 (10- to 12-ounce) package vanilla or white chips
1 (7 ounce) jar Marshmallow Creme
3 teaspoons orange extract
12 drops yellow food coloring
5 drops red food coloring

Use 1 1/2 teaspoons butter to butter  a 13 x 9-inch pan.

In a heavy saucepan, combine the sugar, cream and remaining butter. Cook and stir over low heat until sugar is dissolved. Bring to a boil; cook and stir for 4 minutes. Remove from the heat; stir in chips and Marshmallow Creme until smooth. Remove 1 cup and set aside. Add orange extract and food colorings to remaining mixture; stir until blended. Pour into prepared pan. Drop the reserved marshmallow mixture by tablespoonsful over the top; cut through mixture with a knife to swirl. Cover and refrigerate until set.

Cut into squares.