Prepare all ingredients.
Spread half of the softened butter onto one side of each piece of toasted bread.
In a skillet, heat the olive oil over high heat. Once the oil begins to smoke, place the scallops in the pan and cook for 30 seconds without stirring.
Toss the scallops and stir in the minced garlic. Cook until fragrant (about 30 seconds).
Add the white wine and lemon juice; bring to a boil and cook for another 30 seconds.
Stir in the parsley, cold butter cubes, cayenne pepper, salt, and black pepper. Remove from heat.
As the butter melts, adjust seasonings if needed.
Top each toast with scallops and serve immediately.
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