Drain mashed peaches.
Combine drained peaches, sour cream, sugar and liqueur or brandy.
In large bowl stir ice cream just till softened; fold in peach mixture.
Turn into 5-cup mold.
Freeze several hours or overnight or till firm.
Unmold onto serving plate.
Let stand 15 minutes.
If desired, drizzle with additional liqueur.
Garnish with additional peach slices.