Rinse frozen shrimp to separate, then arrange in a single layer on a baking sheet.
In the bowl of a food processor, add cold butter, garlic, lemon juice, salt, parsley, and red pepper. Pulse until combined. Sprinkle cold butter crumbles over the shrimp.
Bake until shrimp is opaque and butter is hot and bubbly (cooking time depends on size of shrimp - consult package directions).