Heat the skillet and melt the butter.
Add the pierogies and sprinkle seasoning. Saute until brown on each side. Then remove the pierogies from heat and set aside.
Add ground beef to skillet, sprinkle with seasoning, and brown.
Once the beef is cooked, add frozen vegetables and remainder of seasoning. Allow to thaw and warm through.
Add back in pierogies and stir to combine.