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Preheat oven to 350 and grease a 9×13 casserole baking dish.
Add oil, heat it through and add onions. Saute onions until they start to brown.
Smash and mince garlic and add it to the onions. Stir and saute until fragrant.
Let the mixture heat through and start to thicken.
Stir in sour cream, cheese, salt, and pepper. Let the mixture cook and thicken as the cheese melts. Taste to make sure you have enough seasoning.
Stir in parsley.
Spread some more cheese on top and bake for 35-40 minutes, until casserole browned and bubbles around the edges.
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