9 lasagna noodles
2 tablespoons olive oil
1 medium onion, diced
3 cloves garlic, minced
8 ounces mushrooms, sliced (button or cremini)
4 cups fresh spinach, roughly chopped
1 cup ricotta cheese
1 cup mozzarella cheese, shredded
1/2 cup parmesan cheese, grated
1 cup heavy cream
1 teaspoon dried oregano
1/2 teaspoon nutmeg
Salt and pepper to taste
Fresh parsley, chopped (for garnish)