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Preheat oven to 400º F and set up a large bowl of ice water next to workstation.
Bring a large pot of salted water to boil and add beans. Cook for 4-6 minutes, or until bright green and tender-crisp.
Transfer green beans to ice bath to stop from cooking further, then drain and place in a large baking dish. (11×7 works well.)
Melt butter in a medium pan or skillet over medium heat.
Once melted, saute onion until softened. About 4 minutes.
Stir in flour and garlic powder and cook for 1 minute, stirring until smooth. Season with salt and pepper.
Mix in sour cream and cook until mixture just begins to boil.
Pour sour cream mixture over green beans and mix together so everything is thoroughly coated, then sprinkle grated mozzarella over the top.
Place baking dish in oven and cook for 20-22 minutes, or until cheese is melted and bubbly.
Remove from oven and let cool 5 minutes before serving.