Arrange bread cubes in an 11 x 7-inch baking dish coated with cooking spray.
Coat a large nonstick skillet with cooking spray; place skillet over medium-high heat until hot.
Add sausage and green onions; cook until sausage is browned, stirring until it crumbles.
Drain sausage mixture, if necessary.
Layer sausage mixture and cheese over bread cubes.
Combine milk and remaining 4 ingredients; pour over bread mixture. Press down on bread mixture with a spatula to cover totally with milk mixture. Cover and chill 8 hours or overnight.
Preheat oven to 35
Bake casserole, uncovered, at 350 for 30 minutes or until set and lightly browned.