Grease a 13x9 pan and preheat oven to 350 degrees.
Chop bread into bite-size pieces and spread in prepared pan.
Sprinkle sausage over the bread.
Sprinkle cheese over.
In a large bowl, whisk together milk, eggs, garlic salt and pepper. Pour over the ingredients in the pan.
Bake for 45 minutes, or until a knife inserted in the center comes out clean.
Let stand for 5 minutes before cutting.