Slow Cooker Mac and Cheese

Bahan-bahan (9 porsi)

• 1/4 cup butter (melted (half stick))
• 2 cups dry elbow macaroni (9 ounces)
• 1 12 -ounce can evaporated milk (no substitutions)
• 1 cup whole milk
• 1/2 cup cream*
• 1/2 cup mayonnaise
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 1/8 teaspoon cayenne pepper (for flavor, not heat)
• 8 ounces yellow American cheese (chopped into chunks)
• 6 ounces sharp cheddar cheese (freshly shredded (1 and 1/2 cups packed))
• 2 ounces Parmesan cheese (freshly shredded (1/2 cup packed))
• extra sliced cheese (optional)