Pre-heat oven to 150°.
Rinse scallops and pat dry.
Season scallops with salt and pepper.
Heat cast iron skillet on medium high heat for 2 minutes.
Add 1 tablespoon butter in cast iron skillet to melt.
Add scallops to skillet in a single layer into skillet.
Cook for 5-6 minutes on each side until golden brown.
Cut the lemon in half and sear in the skillet for 2 minutes. This will create a nice flavor to the lemon juice that you will use later.
Remove scallops from skillet, place in on baking dish, and place in oven to keep warm.
Reduce heat to low-medium heat.
Add 1 tablespoon butter and garlic to skillet. Cook about 1 minute until butter is melted. Stir in lemon juice and add salt & pepper.
Pour lemon butter sauce over scallops and garnish with parsley.