Whisk together the mayo and garlic powder in a bowl, Season with salt and pepper to taste. Spread the mayo on each slice of bread.
Medium toast the bread slices.
To build the sandwich, lay down one slice of bread and top with lettuce and tomato seasoned with salt and pepper, another slice of bread topped with cheese and ham, and finally a top slice of bread.
Cut diagonally from corner to corner to create 4 triangle pieces. Place the toothpicks in to hold each one together. Serve 2 pieces per portion with pickles.