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Preheat your oven to 350 degrees.
Next, wash and trim your green beans. If using frozen or canned green beans, see below for notes about substitutions.
Fill a large pot with water and add the green beans. Bring the water to boiling then reduce the heat down to medium. Cook them for about 5 to 7 minutes. Drain the beans in a colander.
Next, in a medium skillet add the two tablespoons of butter over medium heat. Once the butter has melted, add the onions and cook until they are transparent. Add in the flour, one tablespoon at a time while whisking.
Next, add in the salt, pepper, and garlic powder. Reduce the heat and stir in the sour cream.
Spray a 9 x 13 inch casserole dish with non-stick spray. Add your green beans in.
Cover the green beans with the sour cream mixture.
Top with cheddar and Parmesan cheese.
Add the crushed buttery crackers and crispy fried onions on top.
Bake for 20 to 25 minutes at 350 degrees or until the top is golden and the cheese is well melted.