Million Dollar Lasagna

For the Cheese Mixture:
16 oz (450g) ricotta cheese
8 oz (225g) cream cheese, softened
1 cup (100g) grated Parmesan cheese
1 large egg
2 cups (200g) shredded mozzarella cheese (divided)
2 tablespoons fresh parsley, chopped (or 1 teaspoon dried parsley)
For the Layers:
12 lasagna noodles, cooked according to package instructions
2 cups (200g) shredded mozzarella cheese (in addition to cheese mixture)
Extra parsley, for garnish (optional)
Instructions