Leftover Turkey Hot Brown Sandwich - Traeger Grills

Ingredients

• 4 Tablespoons unsalted butter
• 1/3 Cup all-purpose flour
• 4 Cups whole milk
• 1/4 yellow onion
• 2 whole cloves
• 1 Bay Leaf
• 2 Ounces Gruyère, grated
• 2 Ounces Parmesan, grated (about ½ cup), divided
• 8 Slices bacon
• 12 Ounces sliced turkey, preferably leftover from a roast turkey
• 2 plum tomatoes, sliced ¼-inch thick
• 4 Slices Texas toast bread or other thick white bread