Cut a slit, length-wise, into the shell of each piece of crab.
Melt butter in a large skillet over medium heat. Add garlic and cook until translucent, 1 to 2 minutes. Stir in parsley, pepper, and salt. Continue to heat mixture until bubbling.
Add crab legs to the skillet; toss to coat with butter mixture. Simmer until completely heated through, 5 to 6 minutes.
