Pat salmon dry and drizzle with olive oil then season the salmon generously with blackened or Cajun seasoning. Heat olive oil in a pan over medium heat and cook the salmon until perfectly done, about 3 minutes per side. Remove from the pan and set aside.
In the same pan, add the spinach and sauté it in the salmon drippings until wilted. Add the cream cheese and shredded mozzarella, stirring until everything melts down into a creamy mixture. Use a tbsp of water to loosen if it gets too thick. Season to taste, then fold the flaked salmon back in. Mix until combined and creamy.
Slice the Italian loaf in half lengthwise. Spread garlic butter evenly over the cut sides and toast in the oven for about 1–2 minutes until lightly crisp.
Remove from the oven and layer provolone slices across the bread. Return to the oven briefly to melt the cheese about halfway.
Take the bread out again and spread the salmon-spinach mixture evenly over the top. Sprinkle additional mozzarella cheese and fresh parsley over everything.
Bake for another 3–4 minutes, or until the cheese is melted and bubbly to your liking.
Remove from the oven, slice into pieces, and drizzle generously with hot honey.
Serve immediately while warm and crispy on the outside, soft and cheesy on the inside.