Step 1Combine 1/2 teaspoon garlic, oil, Sherry, red pepper flakes, salt and pepper in a resealable plastic bag. Add shrimp and shake to coat evenly. Marinate 15 minutes.
Step 2Fry bacon in skillet over medium heat until crisp, 5 minutes. Drain on paper towels. Set aside.
Step 3Combine mayonnaise with 1/2 teaspoon minced garlic and chipotle; set aside.
Step 4Drain shrimp and saute in hot skillet over high heat until slightly pink and opaque, 2 to 3 minutes. (You can also broil or grill the shrimp).
Step 5Toast bread. Spread each slice with 1 tablespoon chipotle mayonnaise. Divide shrimp between 2 slices. Top with avocado, then bacon slices. Place 2 tomato slices on top of bacon and top with lettuce. Cover with remaining bread slices. Use toothpicks to hold sandwiches together. Cut sandwiches in half and serve.