Preheat the oven to 375°F (190°C).
Break the uncooked ramen noodle block in half through the middle so you have two flat noodle sheets; discard the seasoning packet.
Place one ramen noodle sheet in the bottom of an oven-safe dish.
Top the ramen with 1/4 cup ricotta, 1/2 cup pasta sauce, half of the Parmesan, and 1/2 cup shredded mozzarella.
Place the second ramen sheet on top and repeat the layer with the remaining ricotta, pasta sauce, Parmesan, and mozzarella.
Bake for 35–40 minutes, or until the lasagna is hot and the center is fully cooked.
Remove from the oven and sprinkle with chopped fresh parsley (and red pepper flakes if desired) before serving.