Creamy Mushroom and Caramelized Onion Lasagna — Three Many Cooks

Ingredients

• Salt
• 15 Dreamfields lasagna noodles
• 7 tablespoons olive oil, divided
• 2 medium-large onions, halved and thinly sliced (4 heaping cups)
• Ground black pepper
• 1 teaspoon dried thyme leaves, divided
• 2 pounds baby bella mushrooms, cleaned and sliced
• 8 garlic cloves, minced
• 2½ cups milk
• 1½ cups vegetable broth
• ½ ounce dried mushrooms, finely chopped
• ½ pound grated provolone cheese (2½ cups)
• 1¼ cup grated Parmesan cheese
• 5 tablespoons flour