Pumpkin and Sausage Lasagna - Hummingbird Thyme

Ingredients

• 2 tbsp. Olive Oil
• 2 lb Sweet Italian Sausage (remove casings if links used)
• 1 Large yellow onion
• 8 oz White mushrooms, chopped
• 3 Cloves garlic, minced
• 2 15-oz. cans puréed pumpkin (not pie filling)
• Pinch crushed red pepper flakes
• 1 1/2 tsp. Salt
• 1/2 tsp. Black pepper
• 2 1/2 c Ricotta Cheese (whole-milk preferred)
• 1 c Finely grated Parmesan (or Parmeggiano-Reggiano) cheese
• 1 5-oz. Bag cleaned spinach or baby spinach leaves
• 2 tbsp. Fresh sage, minced
• 1 tsp. Garlic Powder
• 1/2 tsp. Salt
• 2 Lg. Eggs, lightly beaten
• Pinch of Ground Nutmeg
• Salt
• 1 lb Lasagna noodles
• Olive oil, for drizzling
• Non-stick cooking spray for casserole dish
• 4 c Shredded mozzarella
• 1/3 c Finely Grated Parmesan (or Parmeggiano-Reggiano)