Caramelized-Onion Lasagna with Gorgonzola Sauce

Ingredients

• 1 ½ pounds zucchini, cut lengthwise into 1/4-inch-thick slices
• 2 tablespoons all-purpose flour
• 2 (12-ounce) cans evaporated fat-free milk
• 1 ¼ cups (5 ounces) crumbled Gorgonzola or other blue cheese
• ¹/₈ teaspoon ground nutmeg
• Cooking spray
• 12 cooked lasagna noodles
• + 7 more ingredients
• • ¼ cup (1 ounce) grated fresh Parmesan cheese
  • 3 tablespoons butter, divided
  • 8 cups thinly sliced onion (about 2 pounds)
  • ½ teaspoon dried thyme
  • ¼ teaspoon salt
  • ¼ teaspoon black pepper
  • ½ cup dry white wine

Preheat oven to 375°. Melt 2 teaspoons butter in a large nonstick skillet over medium heat. Add onion, thyme, salt, and pepper; cook 20 minutes, stirring occasionally. Add the wine; cook 2 minutes or until wine evaporates. Spoon into a bowl; cool. Melt 1 teaspoon butter in pan over medium-high he...

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