I found this recipe in Woman's World magazine. When I made this recipe I've baked my sausages for 30 minutes at 350 in a 1"-inch of water. During baking I've cooked my peppers, onions added the garlic for the last 5 minutes. After peppers and onions are tender I added my sliced sausages to brown them. I boiled my Pierogies for 15 minutes. I have added my pierogies to my sausage mix or I just top the pierogies with the sausage mix as serving. I skipped the mozzarella.