01 -
Preheat oven to 190°C. Lightly grease a 33 x 23 cm baking dish.
02 -
Bring a large pot of salted water to a boil. Add green beans and cook for 3–4 minutes until bright green. Immediately drain and transfer to an ice bath to halt cooking. Drain again and set aside.
03 -
In a medium saucepan over medium heat, melt butter. Add minced garlic and cook for 30 seconds. Add flour and whisk constantly for 1 minute. Gradually whisk in milk. Bring to a simmer until thickened, then stir in cheddar, Parmesan, cream of mushroom soup, salt, pepper, and paprika. Cook until smooth and creamy.
04 -
In a large bowl, mix blanched green beans with cheese sauce until evenly coated.
05 -
Spread the mixture evenly in the prepared baking dish. Bake uncovered for 20 minutes.
06 -
Remove dish from oven and sprinkle fried onions evenly on top. Return to oven and bake for an additional 5 minutes until topping is golden brown.
07 -
Allow casserole to rest for several minutes before serving warm.