Layered Vegetable Pie

Ingredients

• 2 Tbsp. vegetable or olive oil
• 1 (16 oz.) can mushrooms, sliced
• 1/2 c. finely chopped shallots or onion
• 1 medium clove garlic, minced
• 1 (10 oz.) pkg. frozen chopped spinach, cooked and well drained
• 1 (6 oz.) jar roasted red peppers, drained and cut into strips
• 1 Tbsp. all-purpose flour
• 4 eggs, slightly beaten
• 1 (15 oz.) container Ricotta cheese
• 1/4 c. grated Parmesan cheese
• 3/4 c. diced Mozzarella cheese
• 1/4 tsp. ground nutmeg
• 1/4 tsp. pepper
• pastry for 2-crust 10-inch pie
• 1 egg, separated
• 1 Tbsp. sour cream or heavy cream