Caramelized Onion Mac & Cheese with Crispy Breadcrumbs Recipe

Ingredients

• 2 tbsp unsalted butter
• 2 large yellow onions, thinly sliced
• 1 tsp salt
• 1 tsp sugar
• 1 tbsp balsamic vinegar (optional, for extra depth)
• 400 g elbow macaroni
• Salt for boiling water
• 4 tbsp unsalted butter
• 4 tbsp all-purpose flour
• 3 cups whole milk (warm)
• 1 cup heavy cream
• 1 tsp Dijon mustard
• 1/2 tsp garlic powder
• 1/4 tsp black pepper
• 1 1/2 cups sharp cheddar cheese, shredded
• 1 cup Gruyère cheese, shredded
• 1/2 cup mozzarella cheese, shredded
• 1 1/2 tbsp unsalted butter
• 1 cup panko breadcrumbs
• 1/4 tsp smoked paprika (optional)
• 2 tbsp Parmesan cheese, grated