Spinach Pie Ii

Ingredients

• 1 recipe pastry for a 9 inch double crust pie
• 1 tablespoon olive oil
• 1 onion, finely diced
• 1/2 pound fresh mushrooms, sliced
• 2 bunches fresh spinach, washed, stems removed
• 1 pint part-skim ricotta cheese
• 1/2 cup grated Parmesan cheese
• 1 egg, beaten
• salt and pepper to taste