Cheesy Spaghetti Pie with Portabella & Spinach Seasoning – Lesley Elizabeth

Ingredients

• Unsalted butter, softened (for brushing)
• 1 pound spaghetti
• 3 tablespoons extra virgin olive oil
• 1 medium onion, minced
• 2 garlic cloves, minced
• 1 pound portabella mushrooms, cut into 1-inch pieces
• Kosher salt and freshly ground black pepper
• 1 cup Lesley Elizabeth Spinach Seasoning
• 3 large eggs
• 1 ¾ cups whole milk
• 3 cups shredded Fontina cheese (about 10 ounces)
• 1 cup ricotta cheese
• 1 cup finely grated Parmesan cheese