preheat the oven to 400˚
lightly grease two baking sheets
cut the kielbasa into 3-4 inch lengths and divide between the two pans
in a large bowl toss the the peppers, zucchini and mushrooms with about half of the remaining oil and the salt and pepper, divided between the baking sheets
put the peiroigies in the same bowl
mix the remaining ingredients together and toss with the pierogies, divided them between the baking sheets as well getting as many of them touching the pan, you want them to get crispy and crunchy
bake for 15 minutes and then turn the pierogies and vegetables over and bake for another 15 minutes or until the vegetables are cooked and the pierogies are puffed and crisped