Preheat the oven to 375°F (190°C).
Break the instant ramen packet in half crosswise so each block makes two noodle sheets; discard the seasoning packet.
Place one ramen sheet (uncooked) in the bottom of an oven-safe baking dish.
Top the ramen layer with half of the ricotta (about 1/4 cup), half of the pasta sauce (about 1/2 cup), half of the grated Parmesan (about 2 tablespoons), and half of the shredded mozzarella (about 1/2 cup).
Place the second ramen sheet on top and repeat with the remaining ricotta, pasta sauce, Parmesan, and mozzarella to form a second layer.
Bake the assembled lasagna in the preheated oven for 35–40 minutes, or until the dish is hot throughout and the cheese is melted and bubbly.
Remove from the oven and sprinkle with chopped fresh parsley (and red pepper flakes if desired) before serving.