Preparation / Directions:
Arrange half of the croissant cubes in ungreased square baking dish, 8 X 8 X 2 inches. Sprinkle with 1/2 cup of the cheese, the chicken and onions.
Arrange remaining cubes over top. Beat milk, eggs, mustard and salt. Pour over cubes. Cover and refrigerate at least 2 hours but no longer than 24 hours.Heat oven to 325 degrees. Bake uncovered 1 to 1-1/4 hours or until knife inserted in center comes out clean. Sprinkle with remaining 1/2 cup cheese. Bake about 2 minutes longer or until cheese melts. Serve immediately.