Meanwhile, add the frozen shrimp to a cold sauté pan. Cook over medium heat for 4 minutes, turning occasionally. Pour off any liquid and return the pan to the burner, along with the seasoned butter medallions, beans, and artichokes. Cook 2 minutes, stirring once to twice, or until the butter has melted and the shrimp are opaque. Remove the pan from the heat and stir in the spinach.