To prepare the peppers, cut a round section on the top of the pepper and discard the seeds and scrape away the insides.
Using a very sharp and small knife, carve Jack-o-Lantern faces into each pepper. Then bring a pot of water to a boil over high heat. Add 1/4 teaspoon salt and place peppers in the pot. Boil until slightly softened about 3-4 minutes (take care not to overcook or they might fall apart later on). Drain the water.
Meanwhile cook pasta in a pot of boiling salted water until just tender but still firm to bite (or cook the pasta according to the package directions). Once cooked, drain and transfer to a bowl. Toss with olive oil. Add marinara sauce (or pasta sauce) and cilantro. Stir to coat.
Then stuff the peppers with the pasta mixture and serve.