Bacon and Mushroom Lasagna

Name: Bacon and Mushroom Lasagna
Ingredients: 1/2 cup (1 stick) unsalted butter; 2/3 cup all-purpose flour; 5 cups whole milk, at room temperature; 1 tablespoon kosher salt; 1 dried bay leaf; 1 tablespoon olive oil; 1/2 pound bacon, diced; 2 pounds mixed mushrooms such as portobello, cremini or royal trumpet, diced; 2 1/4 teaspoons kosher salt; 1/2 red onion, diced; 1 carrot, peeled and diced; 1 celery stalk, diced; 2 garlic cloves, chopped; 1/2 teaspoon dried thyme; 1/2 cup white wine; Unsalted butter, for buttering the baking dish; 12 no-boil flat lasagna noodles; 2 1/4 cups freshly grated Parmesan