Working with one sandwich at a time, or assembling all four simultaneously, arrange 4 ounces turkey meat on the bottom half of a croissant. Top each with 2 slices of bacon, a lettuce leaf, tomato slices, and avocado slices.
Season the tomato and avocado slices to taste with salt and pepper. Spread 1 tablespoon of mayonnaise on the top half of each croissant and place on top of the sandwich.
Bacon: To cook bacon in the oven, arrange it in a single layer on a rack set over a rimmed baking sheet. Bake for 10 to 15 minutes in a 400-degree oven.
Yield: This recipe makes 4 sandwiches.
Storage: Store leftovers covered in the refrigerator for up to 2 days.
BLT croissant sandwich: For a classic BLT on a croissant, omit the turkey.
Club croissant sandwich: Substitute ham for the bacon and omit the avocado.
More toppings: Try sliced cucumbers, a handful or sprouts, or dill pickle slices.
Mayonnaise mix-ins: Flavor your mayonnaise with a spoonful of pesto or a few cloves of mashed roasted garlic. To make honey mustard sauce, whisk together 1/4 cup mayonnaise, 1 tablespoon honey, 1 tablespoon yellow mustard, and 1 teaspoon lemon juice.