Preheat oven to 425 degrees F.
Place potatoes, green beans and onion on a large rimmed baking sheet. Drizzle with oil and sprinkle with 1/2 tsp. salt and 1/4 tsp. pepper. Nestle chicken into the vegetables.
Grate 1/2 tsp. zest from orange and squeeze it to get 2 Tbsp. juice. Combine the zest and juice, preserves, soy sauce (or tamari), garlic and the remaining 1/4 tsp. each salt and pepper in a small bowl. Brush the chicken with half of the glaze.
Roast the chicken and vegetables for 15 minutes. Stir the vegetables; turn the chicken and brush with the remaining glaze. Continue roasting until the chicken registers at least 165 degrees F on an instant-read thermometer and the potatoes are tender, about 20 minutes more.
People with celiac disease or gluten-sensitivity should use soy sauces that are labeled "gluten-free," as soy sauce may contain wheat or other gluten-containing sweeteners and flavors.
2 1/2 vegetable, 2 lean protein, 1 fat, 1 other carbohydrate, 1 starch