Bring a large pot of salted water to a boil. Add beans and boil until color changes to bright green, 2 to 3 minutes.
Drain beans completely and run under cold water or submerge in a bowl with ice-cold water to stop the cooking process. Once cooled, drain completely and set aside.
Combine bell pepper, mango, and shallots in a large salad bowl. Add green beans and feta cheese; toss to combine.
Combine onion, balsamic vinegar, sugar, mustard, and poppy seeds together in a bowl. Drizzle in olive oil while whisking rapidly until dressing is smooth. Season with salt and pepper.
Drizzle about 1/4 cup vinaigrette over the salad and mix to combine.
Nutritional Facts
Per 4 servings
Calories: 342
Carbohydrate: 40g
Fat: 19g
Fiber: 7g
Protein: 7g
Sugar: 26g
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