In a large nonstick skillet over medium heat, cook chopped sweet onion and bacon until bacon is nearly done and onion has begun to soften and turn slightly golden.
Add frozen pierogies and broth, stirring so that all pierogies are completely moistened. Turn the heat up to high, cover and cook until pierogies are done.
Thicker-cut bacon varieties weigh about twice as much per slice as regular-cut slices, which is why we offer more specific weights in the ingredient list.