Prepare the Olive Salad: In a glass or ceramic bowl, mix your chopped olives, giardiniera, garlic powder, and oregano. Allow it to rest for a few hours or overnight to deepen the flavors.

Slice the Bread: Using a serrated knife, carefully cut the muffuletta bread in half horizontally.

Layer the Ingredients: On the bottom half of the sliced bread, generously spread your homemade olive salad. Then, stack layers of salami, ham, and capicola, followed by a slice of provolone cheese.

Press the Sandwich: Gently place the top half of the bread on your layered masterpiece and press down firmly. Wrap the sandwich tightly in plastic wrap and refrigerate for at least one hour.

Serve: Unwrap and cut the sandwich into wedges. Serve cold or at room temperature.