Butternut Squash & Bacon Mac n' Cheese

INGREDIENTS

• 12 slices thick-cut peppered bacon, cut into ½-inch pieces
• ½ butternut squash, finely diced
• ½ yellow onion, finely diced
• Salt and fresh ground pepper, to taste
• 8 tablespoons unsalted butter, divided
• 4 tablespoons all-purpose flour
• 3 cups whole milk
• 8 ounces Gruyere cheese, shredded (about 2 cups), divided
• 8 ounces sharp cheddar cheese, shredded (about 2 cups), divided
• 16 ounces cavatappi pasta (or shaped pasta of your choice)
• 1 cup plain breadcrumbs