Brownies with Marshmallow Mint Sauce

1 (16 ounce) package brownie mix
1/2 (1 pint) jar Marshmallow Creme
2 tablespoons green creme de menthe
Vanilla ice cream

Prepare fudge-type brownies according to package directions. Cool slightly; cut into large bars or squares. Blend together the Marshmallow Creme and creme de menthe. To serve, top each brownie with a scoop of ice cream. Spoon mint sauce over top.