Add sausage, salt, and pepper; saut 5 minutes, stirring to crumble.
Remove mixture from pan; drain. Wipe pan.
Return sausage mixture to pan. Stir in flour; saut 30 seconds, stirring constantly.
Combine milk and eggs, stirring well. Reduce heat to medium. Stir milk mixture into sausage mixture; bring to a boil, and cook 2 minutes, stirring constantly.
Remove from heat; stir in spinach. Spoon spinach mixture into an 11 x 7-inch glass or ceramic baking dish coated with cooking spray.
Place bread in a food processor, and pulse until 1 cup coarse crumbs form.
Heat a large skillet over medium-high heat.
Add remaining 1 1/2 tablespoons olive oil to pan, and swirl to coat. Stir in crumbs, and saut for 3 minutes or until toasted, stirring frequently.
Sprinkle crumbs over spinach mixture, and top with cheese.