Spinach Mac And Cheese

Name: Spinach Mac And Cheese
Ingredients: 1 slice(s) (1-ounce) soft multi-grain sandwich bread; 1 tablespoon(s) unsalted butter; 1/3 cup(s) grated Parmesan cheese; 2 cup(s) 1 percent low-fat milk; 2 tablespoon(s) all-purpose flour; 1 teaspoon(s) minced garlic; 4 ounce(s) shredded sharp Cheddar cheese; 4 ounce(s) shredded Fontina cheese; 1 teaspoon(s) Dijon mustard; 1/4 teaspoon(s) kosher salt; 1/4 teaspoon(s) cayenne pepper; 8 ounce(s) penne rigate pasta; 1 bag(s) (6-ounce) baby spinach leaves