Step 1: Heat your oven to 300° Fahrenheit.
Step 2: Get out a large pot, and on medium heat, melt the butter.
Step 3: Next, put in the cornstarch, sour cream, onion, and Swiss cheese. Mix it all together. Add the green beans. Stir.
Step 4: Place the mixture into a casserole dish. Put it in the oven and cook for 15 minutes. Add the cornflakes on top and cook for 10 minutes more.
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