Heat grill or grill pan. Once hot, grill peach pieces cut side down for approximately 2-3 minutes. Remove from heat.
When the peaches are cool enough to handle, cube peaches.
In a large pitcher, add grilled peaches, Pinot Grigio, simple syrup, schnapps and lemon juice. Stir to combine.
Refrigerate the mixture for at least one hour.
When ready to serve, pour into champagne and stir. Serve chilled.