Mix the binder. Lightly beat the eggs in a large bowl, then stir in the half and half, breadcrumbs, parsley, basil, oregano, Parmesan, salt, pepper, and red pepper flakes.
Add the beef. Add the ground chuck and mix gently with your hands until just combined, since overmixing makes tough meatballs.
Shape. Roll the mixture into equal meatballs, about 1 1/2 inches wide.
Heat the sauce. Bring the marinara to a boil in a large pot over medium heat, stirring often. Add the raw meatballs and return to a boil without stirring.
Simmer. After 5 minutes, stir very gently, reduce the heat to low, and simmer about 45 minutes, stirring gently every 5 minutes, until the meatballs reach 160 degrees F inside.
Finish. Lift the meatballs onto a rack over a baking sheet, simmer the sauce to your preferred thickness, then serve with sauce and fresh basil.