1. Prepare ingredients
Preheat oven to 425. Wash and dry produce. Cut potatoes into ½-inch thick wedges. Halve and peel shallot. Grate one half on the largest holes of a box grater, place in large bowl. Mince remaining shallot. Peel and mince garlic. Roughly chop parsley.
2. Roast Potatoes
Toss potatoes on a baking sheet with a drizzle of olive oil, salt, and pepper. Roast on top rack until browned and tender, about 20-25 minutes.
3. Bake Meatloaves
Meanwhile, to bowl with grated shallot, add beef, garlic, panko, half the parsley, salt, and pepper. Gently combine, then form in to tow 1-inch-tall loaves. Place on one side of a second baking sheet. Brush tops of meatloaves with half the ketchup. Bake on middle rack for 5 minutes. (You’ll add the green bean then).
4. Roast Green Beans
Once meatloaves have baked 5 minutes, remove sheet from oven. Carefully toss green beans on empty side with a drizzle of olive oil, salt, and pepper. Return to middle rack until green beans are tender and meatloaves are cooked through, about 12-15 minutes more.
5. Make Gravy
Melt ½ tablespoon butter in a medium pan over medium heat. Add minced shallot, cook, stirring until softened, about 3-4 minutes. Sprinkle with flour, whisk vigorously to combine. Stir in stock concentrate and ½ cup water. Bring to a simmer and cook until thickened and saucy, about 3-4 minutes. Stir in remaining parsley, season with salt and pepper.
6. Finish & Serve
Slice meatloaves crosswise. Divide meatloaves, potato wedges, and green beans between plates. Spoon gravy over meatloaves and serve.