Combine first 11 ingredients in a large bowl; toss well. Cover and marinate in refrigerator 30 minutes.
Preheat oven to 425°.
Fold 4 (16 x 12-inch) sheets of heavy-duty aluminum foil in half crosswise. Open foil. Remove shrimp mixture from bowl; reserve marinade. Place about 2 1/4 cups shrimp mixture on half of each foil sheet. Drizzle remaining marinade evenly over shrimp. Top each serving with 1 teaspoon butter. Fold foil over shrimp; tightly seal edges.
Place packets on a baking sheet. Bake at 425° for 20 minutes. Let stand 10 minutes. Place on plates. Unfold packets carefully; peel shrimp, and serve immediately.