Cook pasta al-dente according to package. Drain pasta, reserving 1 cup of the pasta water.
In a large sauté pan, heat the olive oil; add red pepper flakes and arugula, sauté until arugula starts to wilt.
Add garlic, tomatoes, salt, and pepper and sauté for 1 minute.
Toss in pasta and stir until heated through. Immediately add beaten eggs (or cream) to the hot pasta and toss until set. If pasta is dry, add a little of the pasta water until desired consistency is reached. Remove from heat.