Blanch the asparagus in a pot of salted boiling water for 2 minutes.
In the meantime, fill a large bowl with cold water and ice.
Remove the asparagus from the boiling water and transfer them to the ice bath to stop the cooking process. Drain them and dry them off thoroughly with a clean kitchen towel.
In a small bowl, mix the cream cheese with the blue cheese using a fork until the mixture is smooth and spreadable. Season to taste with salt and pepper. Go easy on the salt, since the cheese is quite salty.
Preheat the oven to 400°F and line a baking sheet with parchment paper.
Remove the crusts from the bread and use a rolling pin to flatten each slice out. Trim to form a rectangle.
Spread the blue cheese mixture over the bread, all the way to the edges. Place 4 asparagus spears on the bread.
Roll the bread and trim the ends.
Spread butter over the rolls and place them on the baking sheet.
Bake for 10 minutes, until the rolls are golden brown.