Heat the oven to 375°F. In a large bowl combine the ground beef, ground pork, 1/2 cup breadcrumbs, egg, onion, 2 minced garlic cloves, 1 teaspoon salt, and 1/2 teaspoon pepper. Mix until evenly blended.
Shape the mixture into a loaf on a rimmed baking sheet. Stir together the remaining 1/4 cup breadcrumbs with the parsley, thyme, and rosemary. Press this mixture firmly over the top and sides of the loaf.
Bake the meatloaf for 45 to 50 minutes until it reaches 160°F in the center.
While the meatloaf bakes, place the new potatoes in a pot of salted water. Bring to a boil and cook 12 to 15 minutes until tender. Drain and set aside.
Heat the olive oil in a large skillet over medium heat. Add the remaining 2 minced garlic cloves and cook 30 seconds. Add the green beans and cook 4 minutes, then stir in the drained potatoes. Season with salt and pepper and cook 3 more minutes until the beans are crisp-tender.