Melt 1 tablespoon of the butter in a large heavy skillet over medium-high heat.
Sprinkle both sides of steaks with salt, and a generous amount of ground black pepper. Add to skillet, and cook about 4 minutes per side for medium doneness.
Transfer steaks to a broiler pan, and top each with 1 oz. bleu cheese.
Place on top rack of oven, and broil until a light crust forms on the cheese.
Remove from oven, and place on a serving platter; keep warm.
In the same skillet you cooked the steaks, return to medium-high heat and add remaining 4 tablespoons of butter. Melt butter, and cook until it begins to turn a light brown color.
Remove from heat, and spoon over crusted steaks.