Heat olive oil in a cast iron skillet on medium heat. Add garlic. Sear scallops on each side.
In a sauce pan, warm the butter until fully melted. Reserve 1 tablespoon of melted butter in a small dish. Mix flour with the 1 tablespoon of the melted butter to make a roux, set aside.
Add the heavy cream to the saucepan and bring to a simmer. Add the onion powder, salt, pepper and cheese to the simmering cream.
Add the roux (butter & flour sauce). Mix thoroughly until cheese are completely melted. Pour on top of the scallops in the cast iron pan and place in oven on broil.
Cook until sauce becomes bubbly and begins to brown on top.
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