Preheat the oven to 425°.
Mix the butter, garlic salt, and seasoning blend.
Unfold the puff pastry sheets onto a lightly floured surface. Spread each with 1 ½ tbsp of the butter mixture, and sprinkle with ½ cup of cheese.
Top with prosciutto, pressing lightly to adhere.
Using a pizza cutter or a sharp knife, cut each sheet into 12 strips (about ½-inch thick).
Wrap each strip, filling side in, around an asparagus spear.
Place on parchment paper lined baking sheets.
Bake until the wraps golden brown, about 15 minutes. Serve them warm.