To make Savory Filling, in another 8-inch skillet over medium heat, melt butter. Add onion; cook about 15 minutes or until caramelized. Meanwhile, heat another 8-inch skillet over medium-low heat. In small bowl, beat eggs and pesto with whisk until blended. Pour into skillet; cook and stir to make scrambled eggs. Remove eggs from heat; divide evenly among 4 open crepes. Top with onion and cheese. Fold over crepes. Serve.