Recipe Details

Ingredients

• 4 slices thick cut bacon, cut into ¼-inch thick pieces
• 4 small yellow onions, cut into half moons
• kosher salt, to taste
• 16 oz macaroni, or pasta of choice
• 6 tablespoons butter, divided, plus more for the pan
• 1/4 cup all-purpose flour
• 5 cups whole milk, warm
• 1 tablespoon Dijon mustard
• 1 teaspoon hot sauce (such as Frank's® RedHot Original Hot Sauce)
• 1 pinch ground nutmeg
• freshly ground black pepper, to taste
• 2 1/2 cups sharp Cheddar cheese, freshly shredded
• 6 ounces Gruyere cheese, grated
• 1 bunch scallions, green tops only, thinly sliced
• 1 cup Panko breadcrumbs
• flaky salt, to finish