Preheat your oven to 350°F (175°C). Yes, this is a real temperature, not a dream. Grease a casserole dish so nothing sticks like a moody ex.
Blanch the green beans for 3–4 minutes (if using fresh). Drain and shock in cold water to keep that snap. If you’re using frozen, skip the blanching—just thaw and drain.
In a bowl, whisk together the cream of mushroom soup and milk until smooth. No lumps allowed on your plate’s personality.
Stir in garlic powder, pepper, and a pinch of salt. If you’re feeling fancy, fold in half the cheese here.
Fold the beans into the creamy mix. Spoon into the prepared dish and smooth the top.
Top with the crispy French-fried onions (or more cheese, if you’re feeling bold). Bake 25–30 minutes, until bubbly and golden.
Give it a quick stir, then bake another 5 minutes if you like extra crispiness on top. Let it rest a few minutes before serving so you don’t scorched-mouth it.