• Cook pasta al dente according to package instructions (it will finish cooking in the oven.) Drain, rinse, and set aside.
• In a large pot, heat butter over medium-high heat. Add garlic and onions sauté until onions are translucent. Add mushrooms, and salt, then sauté for a couple more minutes. Pour in 1C broth with mushrooms and cook until the liquid reduces by half.
• Sprinkle in flour, stir with the mushrooms for another minute let the flour mixture bubble for a minute to remove the starchy taste. Pour in the broth and stir, cooking for another few minutes to thicken the roux.
• Reduce heat to medium low. Cut cream cheese into pieces and add it to the pot. Stir it to melt, add the leftover turkey, the peas, the bacon, and the cheeses. Stir to combine, adding salt and pepper as needed.
• Add the cooked pasta and stir it to combine. Use more broth as needed to thin; the mixture needs to have a little extra moisture to finish cooking in the oven. Add up to 2 more cups of liquid if needed.
• Pour the mixture into a large baking dish and sprinkle with Panko crumbs. Bake at 350 degrees F for 30 minutes, or until the casserole is bubbly and the crumbs are golden brown.