Preheat the oven to 400 F.
Peel and dice the beets and sweet potatoes into 1" pieces. Add them to a sheet pan and toss with 2 tbsp of olive oil and a pinch of salt.
Bake for 35-40 minutes, flipping halfway through.
While that bakes, thinly slice your fennel bulb using a sharp knife or mandolin.
Add the lentils to a salad bowl with the shaved fennel, roasted sweet potatoes & beets, chopped herbs and pumpkin seeds.
Prepare the dressing on the side. Combine the olive oil, dijon, maple, vinegar, and salt & pepper together in a jar or small bowl.
Pour over the salad and toss together. Adjust salt to taste.
Serve as is or with crumbled feta or goat cheese.
Leftovers can be refrigerated for up to 4 days.