Place cleaned shrimp in bowl and add Melted Butter, Olive Oil, Lime Zest, Lime Juice, Tequila, Cilantro, Parsley Flakes, Salt, Black Pepper, Sugar, Onion Powder and Garlic Powder. Toss well and marinate at least 1 hour.
Place shrimp on hot oiled grill pan or flat griddle and cook 2 minutes on each side or until firm, white inside and pink outside.