[header] How to make pierogi casserole [title] Preheat the oven and prepare the pan. [step] Turn the oven on to 400 degrees f (200 c). Get out a 9 x 13 (23 x 33 cm) baking pan and coat it with cooking spray. 
This will keep your casserole from sticking to the pan. [title] Melt the cream cheese in chicken broth.