In a large skillet over medium heat, melt butter. Add onions and a pinch salt and cook, stirring occasionally, until golden, about 30 minutes. Sprinkle with rosemary and season with salt and pepper.
Set an egg roll wrapper in a diamond shape in front of you and spoon cranberry sauce in the center. Add a slice of brie and a spoonful of onions on top. Fold up bottom half and sides, then gently roll, sealing the seam with a couple drops of water. Repeat with remaining filling and wrappers.
In a large, deep skillet, heat 1" vegetable oil over medium heat until it starts to bubble. Working in batches, add egg rolls and fry until golden, 1 minute per side.
Drain on a paper towel–lined plate and let cool slightly. Repeat with remaining egg rolls.
Serve warm, sprinkled with Parmesan and chives.
Recipe by 5* trending recipes with videos at https://food.theffeed.com/2021/12/13/cranberry-brie-egg-rolls-2/