Mini Macaroni and Cheese Appetizers

Ingredients (9)

• 8 ounces small elbow macaroni
• 1 1/2 tablespoons unsalted butter,
• 1/4 cup freshly grated Parmesan cheese
• 2 tablespoons all purpose flour
• 3/4 cup milk
• 4 ounces (1 packed cup) shredded cheddar cheese
• 4 ounces deli sliced American cheese,
• 1 large egg yolk
• 1/4 teaspoon smoked Spanish paprika