Place the peeled and deveined shrimp in the slow cooker, spreading them in an even layer.
In a small bowl, whisk together the melted butter, minced garlic, lemon juice, salt, and pepper.
Pour the butter mixture over the shrimp, making sure each piece is well coated.
Cover the slow cooker and cook on low for 1–2 hours, or until the shrimp are pink, opaque, and tender.
Give the shrimp a gentle stir, then serve immediately. Pair with steamed rice, pasta, or crusty bread to soak up the garlicky butter sauce.
Enjoy!