Best Pumpkin Lasagna Recipe - How To Make Pumpkin Lasagna

Ingredients

• 1/2 c. (1 stick) unsalted butter
• 1 onion, chopped
• 4 cloves garlic, finely chopped
• 1 tsp. cider vinegar
• 1 tsp. dried sage
• 3 (15-oz.) cans pumpkin puree
• 2 tbsp. pure maple syrup
• 1 tsp. grated fresh nutmeg
• Kosher salt
• Freshly ground black pepper
• 1 large egg, beaten to blend
• 1 (15-oz.) container ricotta cheese
• 3 c. shredded Fontina, divided
• 3 c. shredded mozzarella, divided
• Cooking spray
• 1 lb. no-boil lasagna noodles