Pour the marinara sauce into a large saucepan over medium heat and stir occasionally.
Heat ¼ cup of olive oil in a skillet, add finely diced yellow onion and sauté until translucent, then add minced garlic and sauté for another minute.
In a large mixing bowl, combine ricotta cheese, whisked egg, half and half, Italian breadcrumbs, Parmesan cheese, chopped parsley, dried herbs, and sautéed onion-garlic mix. Fold in ground meats gently.
Form the mixture into golf ball-sized meatballs and place them on a baking sheet lined with parchment paper.
Cook the meatballs by either simmering them in the marinara sauce for 30-40 minutes or baking them at 375°F for 25-30 minutes.
Remove the meatballs from the sauce or oven, serve hot over pasta or in sub rolls, and garnish with parsley.
Enjoy the Ricotta Meatballs with friends and family.