Butter bottom and sides of a 9x13 pan
Arrange 4 lasagna noodles on the bottom of the pan.
On top of these noodles spread 1 cup of the mashed potatoes evenly to cover the noodles.
Layer 4 more noodles atop the potatoes
On those noodles evenly spread the ricotta mixture.
Layer 4 more noodles atop the ricotta
Spread 1 cup of the mashed potatoes to evenly cover the noodles.
Layer 4 more noodles atop the potatoes
Evenly arrange the sausage and onion mixture on top of the top noodles.
For added richness, drizzle 1-2 tsp melted vegan butter over the top.
Bake for 25-35 minutes or until sausages are sizzling and the edges of the noodles are beginning to crisp.
Serve with vegan sour cream, bacon bits, and chopped chives or green onions.