Preheat oven to 425°F.
Cube bread into 1-inch cubes and place in a large bowl.
Mix together eggs, milk, salt and pepper and pour over bread. Toss to coat and let soak for 10 minutes.
Add sausage and spinach and mix well. Pour mixture into a lightly greased 8-inch x 8-inch baking pan.
Bake approximately 20 minutes.