Cook the Bacon: Heat a large skillet over medium heat. Add thick-cut bacon slices and cook for 5-7 minutes until crispy. Remove and drain on paper towel.

Prepare the Vegetables: Wash and dry butter lettuce. Slice tomatoes and avocados into ¼-inch pieces.

Make the Spicy Mayo: In a mixing bowl, whisk mayonnaise, mustard, and sriracha until smooth.

Toast the Bread: Butter both sides of rye bread and toast in the skillet for 2-3 minutes each side until golden brown.

Assemble the Sandwiches: Spread spicy mayo on the toasted bread, layer bacon, tomato, avocado, and lettuce, then top with the other slice.

Serve and Enjoy: Slice sandwiches in half and serve immediately with sides if desired.