Combine first 7 ingredients; stir with a whisk until well blended.
Combine tomato, corn, 1 cup green onions, and coriander.
Arrange half of bread cubes in bottom of a 13 x 9-inch baking dish coated with cooking spray. Sprinkle evenly with half of tomato mixture, 1/2 cup cheese, and half of bacon. Pour half of milk mixture over top. Repeat procedure with remaining bread, tomato mixture, and milk mixture. Sprinkle with remaining 1/2 cup cheese, remaining half of bacon, and 1/4 cup green onions. Cover and refrigerate 8 hours or overnight.
Preheat oven to 350°.
Uncover strata. Bake at 350° for 50 minutes or until set.