Preheat oven to 400 degrees.
While asparagus are roasting add shrimp, chopped garlic, parsley, paprika, and red pepper flakes to gallon ziplock bag. Shake until combined and shrimp are coated with spices.
Remove asparagus from oven. Dump shrimp from gallon ziplock bag onto left side of pan. Place 8 slices of butter over shrimp. Salt/pepper, to taste. Bake shrimp and asparagus for 6-8 minutes, or until shrimp are opaque and fully cooked and asparagus is soft yet crisp.