1-First Step: Gather and prepare ingredients Collect all sandwich ingredients and set up your workspace. If bacon is not pre-cooked, cook it until crisp using preferred methods like oven baking for less mess and better texture. Slice avocado and have turkey and cheese ready.

2-Second Step: Toast the bread Heat a medium frying pan over medium heat and melt butter. Place sourdough bread slices in the pan, pressing gently so they absorb some melted butter. Toast the slices until they turn medium golden brown for a crispy texture.

3-Third Step: Assemble layers Place a slice of smoked gouda cheese on one piece of toast, breaking the slice if necessary to fit. Warm the turkey slices in the pan for about 30 seconds on each side for enhanced flavor and stack them on top of the cheese. Add crisp cooked bacon next.

4-Fourth Step: Spread sauces and add avocado Spread a thin layer of sriracha sauce or the spicy Japanese mayonnaise mixture on the other slice of toasted bread. Then layer smashed or sliced avocado evenly over the sauce. Optionally, sprinkle sliced scallions, flaky sea salt, and freshly ground black pepper on top for extra flavor.

5-Final Step: Finish and serve Close the sandwich by combining both slices. Cut the club sandwich in half diagonally if preferred and serve immediately while warm. For dietary preferences, substitute bread and sauces as needed and adjust spiciness to taste.