Cook lentils according to package instructions.
In a medium saucepan, boil the sweet potatoes for about 15-20 minutes or until soft.
Preheat the oven to 350* F.
Heat 2 Tbsp of the olive oil in a frying pan on medium high heat.
Add the onions and cook till translucent.
Add the mushrooms and cook until brown.
Add the cooked lentils, salt, liquid smoke and the thyme.
Carefully mix all ingredients together, transfer to an oven-safe baking dish and spread out evenly.
Drain the sweet potatoes once done, and add the oat milk, a little salt, remaining 2 Tbsp olive oil, and paprika.
Mash the potatoes with a potato masher or electric mixer until smooth. Add more oil or oat milk if necessary.
Spread the mashed sweet potatoes over the top of the pie.
Bake for 25 minutes and enjoy!