Heat half of the olive oil (2 tablespoons) over medium high heat in a deep skillet and add onion slices. Sprinkle with salt and pepper to taste and saute until golden brown and caramelized, about 15 minutes, stirring frequently.
Pre-heat oven to 350 degrees and line a baking sheet with foil. Using a pastry brush, gently brush both sides of the wonton wrappers with olive oil and sprinkle with rosemary and salt and pepper to taste. Bake until golden brown and crispy, about 7-9 minutes.
Place brie in the center of a baking dish and top with caramelized onions and pepper jelly. Bake in 350 degree onion until warm and starting to melt, about 15-20 minutes. Serve with wonton crisps.