Prepare the Herb Ricotta Mixture
Combine ricotta, garlic, basil, oregano, and parsley in a small bowl. Mix well and set aside.
Sauté Onion and Garlic
Heat 1 tbsp olive oil in a skillet over medium heat. Sauté onion for 5 minutes until softened. Add garlic and cook for 1 minute. Remove from heat and let cool.
Mix Meatball Ingredients
In a large bowl, whisk egg and half and half. Add breadcrumbs, Parmesan, parsley, Italian seasoning, mustard powder, salt, and pepper. Stir in ¾ cup of the ricotta mixture and the cooled onion-garlic mix.
Combine Meat
Add ground chuck and ground pork to the bowl. Gently mix until combined, avoiding overworking the meat.
Shape and Chill Meatballs
Form 1 ½-inch meatballs and place on a tray. Refrigerate for 15 minutes.
Brown the Meatballs
Heat olive oil in a skillet over medium-high heat. Brown meatballs on all sides, then set aside.
Simmer in Marinara Sauce
Remove excess oil from the skillet and pour in marinara sauce. Add ¼ cup water if needed. Return meatballs to the skillet, spoon sauce over them, and simmer partially covered for 30 minutes.
Add Ricotta Topping
In the last 15 minutes, dollop the remaining ricotta mixture on top of the meatballs. Let it meld with the sauce before serving.