Preheat oven to 400°F. Prepare meatballs and marinara sauce. Heat marinara in a medium oven-proof skillet.
Nestle meatballs down into the sauce and bring to a simmer. Spoon some of the marinara sauce up over the meatballs. Sprinkle with a teaspoon or two of freshly minced herbs if desired.
Spread grated cheeses over the top of the meatballs and sauce. Sprinkle with salt and pepper.
Place skillet in the oven and bake 5-10 minutes or until cheese is melted. (Turn on the broiler for 2-3 minutes to brown the cheese a bit if desired).
Garnish with freshly snipped herbs and serve immediately.