Add spaghetti, chicken broth, cherry tomatoes, salt, pepper, and red pepper flakes to the pot.
Bring the mixture to a boil, then reduce heat and simmer uncovered. Stir occasionally, cooking until pasta is al dente and liquid has mostly evaporated, about 15-20 minutes.
Remove from heat and stir in grated parmesan cheese. Serve immediately.
Notes
This recipe is perfect for a quick weeknight dinner. Leftovers can be stored in the fridge for up to 3 days.