Which of the following cocktails is made with peaches and champagne?

The cocktail that is made with peaches and champagne is the Wallaby Darned. This drink is a signature item on the Outback Steakhouse menu and is known for its delightful blend of flavors, primarily highlighting fresh peaches and sparkling champagne. The combination provides a refreshing and fruity taste, making it a popular choice during warmer weather or as a celebratory drink.

In contrast, the other options present different flavor profiles and ingredients. The Sauza Gold Coast Rita is a margarita with a base of tequila and features lime flavors, while the Castaway Cocktail is known for its tropical fruitiness, usually incorporating flavors like pineapple and passion fruit. The Down Under Mule is a variation of the classic Moscow Mule, incorporating vodka and ginger beer, which does not include peaches or champagne. Thus, the distinct combination of peaches and champagne in Wallaby Darned is what makes it the correct choice.