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1
Bring large pot of salted water to boil; blanch green beans 5 minutes until bright green and tender-crisp; drain and reserve.
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2
Melt butter in large baking dish over medium heat; whisk in cream of mushroom soup and milk until smooth and no lumps remain.
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3
Season sauce with salt, pepper, and garlic powder; fold in cooked green beans and three-quarters of fried onions until evenly coated.
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4
Transfer to oven and bake at 180°C for 15 minutes until bubbling at edges.
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5
Top with remaining fried onions; bake 2 minutes longer until onions are warmed and golden.
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6
Remove from oven and serve immediately.