This Cheddar Vidalia Onion Pie is a classic Southern favorite that’s rich, creamy, and full of sweet onion flavor! Made with thinly sliced Vidalia onions, sharp cheddar cheese, and a silky egg custard baked in a flaky pie crust, it’s melty, buttery, and irresistibly savory. Perfect for brunch, potlucks, or an elegant holiday side dish!