Heat the oven to 400°F and line a large rimmed sheet pan with parchment paper.
Mix the beef, stuffing mix, eggs, 1/4 teaspoon salt, 1/4 teaspoon black pepper and 1/4 cup ketchup just until combined.
Shape the mixture into 6 oval patties about 1 inch thick and arrange them on one half of the pan.
Spread the green beans on the other half of the pan and season them with the remaining 1/4 teaspoon salt and 1/4 teaspoon black pepper.
Brush the remaining 1/4 cup ketchup over the meatloaves.
Roast for 24 to 28 minutes, turning the beans once, until the meatloaves reach 160°F and the beans blister.