Roast carrots and sweet potatoes in the oven at 400 degrees for about 10 minutes or until slightly soft, but not browned or cooked all the way through.
While your sweet potatoes and carrots are softening, heat 1 tablespoon of olive oil in a pan and add the diced onion, making sure to stir often. Cook until onions are looking a bit clearish and are relatively soft.
Bring your broth to a boil over medium high heat and add spices.
Add all veggies (except spinach) to the broth and bring down to a simmer.
Let simmer for about 10-15 minutes, or until all veggies are cooked to a consistency you enjoy.
Add in the spinach and cooked lentils, give it a stir and enjoy!