Preheat oven to 400F and prepare a baking sheet with parchment or oil, as desired.
Dump the pierogies onto the pan first and spread out evenly. Add the onion, green cabbage and plant based sausage. Top with the spices and another spray of oil.
Transfer to the oven and bake for 30 minutes turning half way.
While the pierogies bake, prep the sauce ingredients by combining all ingredients in a blender until a smooth vegan cheese sauce is formed.
Remove the pierogies from the oven, and drizzle with the sauce and fresh chives. Enjoy immediately.
